diff --git a/libavformat/aacdec.c b/libavformat/aacdec.c
index 7c17dd05fa..9d7c6d711f 100644
--- a/libavformat/aacdec.c
+++ b/libavformat/aacdec.c
@@ -55,9 +55,9 @@ static int adts_aac_probe(AVProbeData *p)
         if(buf == buf0)
             first_frames= frames;
     }
-    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
-    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
-    else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
+    if   (first_frames>=3) return AVPROBE_SCORE_EXTENSION + 1;
+    else if(max_frames>500)return AVPROBE_SCORE_EXTENSION;
+    else if(max_frames>=3) return AVPROBE_SCORE_EXTENSION / 2;
     else if(max_frames>=1) return 1;
     else                   return 0;
 }
diff --git a/libavformat/ac3dec.c b/libavformat/ac3dec.c
index c531f8a179..3db23397d0 100644
--- a/libavformat/ac3dec.c
+++ b/libavformat/ac3dec.c
@@ -79,9 +79,9 @@ static int ac3_eac3_probe(AVProbeData *p, enum AVCodecID expected_codec_id)
     if(codec_id != expected_codec_id) return 0;
     // keep this in sync with mp3 probe, both need to avoid
     // issues with MPEG-files!
-    if   (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
-    else if(max_frames>200)return AVPROBE_SCORE_MAX/2;
-    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
+    if   (first_frames>=4) return AVPROBE_SCORE_EXTENSION + 1;
+    else if(max_frames>200)return AVPROBE_SCORE_EXTENSION;
+    else if(max_frames>=4) return AVPROBE_SCORE_EXTENSION/2;
     else if(max_frames>=1) return 1;
     else                   return 0;
 }
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index a9ea1d8e1f..1d7ba45b32 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -337,8 +337,10 @@ typedef struct AVProbeData {
     int buf_size;       /**< Size of buf except extra allocated bytes */
 } AVProbeData;
 
-#define AVPROBE_SCORE_MAX 100               ///< maximum score, half of that is used for file-extension-based detection
 #define AVPROBE_SCORE_RETRY (AVPROBE_SCORE_MAX/4)
+#define AVPROBE_SCORE_EXTENSION  50 ///< score for file extension
+#define AVPROBE_SCORE_MAX       100 ///< maximum score
+
 #define AVPROBE_PADDING_SIZE 32             ///< extra allocated bytes at the end of the probe buffer
 
 /// Demuxer will use avio_open, no opened file should be provided by the caller.
diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 3105d339ca..28f2d64527 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -830,7 +830,7 @@ static int avi_read_header(AVFormatContext *s)
 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
     if (pkt->data && !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
         uint8_t desc[256];
-        int score = AVPROBE_SCORE_MAX / 2, ret;
+        int score = AVPROBE_SCORE_EXTENSION, ret;
         AVIStream *ast = st->priv_data;
         AVInputFormat *sub_demuxer;
         AVRational time_base;
diff --git a/libavformat/avs.c b/libavformat/avs.c
index ec9198b7e5..5908d838a1 100644
--- a/libavformat/avs.c
+++ b/libavformat/avs.c
@@ -50,7 +50,7 @@ static int avs_probe(AVProbeData * p)
 
     d = p->buf;
     if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
-        return 55;
+        return AVPROBE_SCORE_EXTENSION+5;
 
     return 0;
 }
diff --git a/libavformat/cavsvideodec.c b/libavformat/cavsvideodec.c
index c035128bcf..5ca3c80b32 100644
--- a/libavformat/cavsvideodec.c
+++ b/libavformat/cavsvideodec.c
@@ -61,7 +61,7 @@ static int cavsvideo_probe(AVProbeData *p)
         }
     }
     if(seq && seq*9<=pic*10)
-        return AVPROBE_SCORE_MAX/2;
+        return AVPROBE_SCORE_EXTENSION;
     return 0;
 }
 
diff --git a/libavformat/dtsdec.c b/libavformat/dtsdec.c
index 5c05758327..cdbfc0cd08 100644
--- a/libavformat/dtsdec.c
+++ b/libavformat/dtsdec.c
@@ -60,7 +60,7 @@ static int dts_probe(AVProbeData *p)
     max = markers[2] > markers[max] ? 2 : max;
     if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 &&
         markers[max] * 4 > sum * 3)
-        return AVPROBE_SCORE_MAX/2+1;
+        return AVPROBE_SCORE_EXTENSION + 1;
 
     return 0;
 }
diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c
index d5aacfd15f..7caa7a7516 100644
--- a/libavformat/flacdec.c
+++ b/libavformat/flacdec.c
@@ -280,7 +280,7 @@ static int flac_probe(AVProbeData *p)
 {
     if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
         return 0;
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 AVInputFormat ff_flac_demuxer = {
diff --git a/libavformat/h261dec.c b/libavformat/h261dec.c
index 1b254d613a..1474a162bf 100644
--- a/libavformat/h261dec.c
+++ b/libavformat/h261dec.c
@@ -56,9 +56,9 @@ static int h261_probe(AVProbeData *p)
         }
     }
     if(valid_psc > 2*invalid_psc + 6){
-        return 50;
+        return AVPROBE_SCORE_EXTENSION;
     }else if(valid_psc > 2*invalid_psc + 2)
-        return 25;
+        return AVPROBE_SCORE_EXTENSION / 2;
     return 0;
 }
 
diff --git a/libavformat/h263dec.c b/libavformat/h263dec.c
index 667fdbdcbb..e6e0345b69 100644
--- a/libavformat/h263dec.c
+++ b/libavformat/h263dec.c
@@ -56,9 +56,9 @@ static int h263_probe(AVProbeData *p)
         }
     }
     if(valid_psc > 2*invalid_psc + 2*res_change + 3){
-        return 50;
+        return AVPROBE_SCORE_EXTENSION;
     }else if(valid_psc > 2*invalid_psc)
-        return 25;
+        return AVPROBE_SCORE_EXTENSION / 2;
     return 0;
 }
 
diff --git a/libavformat/h264dec.c b/libavformat/h264dec.c
index 9c67ab9545..5de582be66 100644
--- a/libavformat/h264dec.c
+++ b/libavformat/h264dec.c
@@ -63,7 +63,7 @@ static int h264_probe(AVProbeData *p)
         }
     }
     if(sps && pps && (idr||sli>3) && res<(sps+pps+idr))
-        return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg
+        return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
     return 0;
 }
 
diff --git a/libavformat/idcin.c b/libavformat/idcin.c
index 1dcc574630..a4085a9466 100644
--- a/libavformat/idcin.c
+++ b/libavformat/idcin.c
@@ -137,7 +137,7 @@ static int idcin_probe(AVProbeData *p)
         return 0;
 
     /* return half certainty since this check is a bit sketchy */
-    return AVPROBE_SCORE_MAX / 2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int idcin_read_header(AVFormatContext *s)
diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index 12cf46265b..e32c951a85 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -185,7 +185,7 @@ static int img_read_probe(AVProbeData *p)
         else if (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))
             return 5;
         else
-            return AVPROBE_SCORE_MAX / 2;
+            return AVPROBE_SCORE_EXTENSION;
     }
     return 0;
 }
diff --git a/libavformat/m4vdec.c b/libavformat/m4vdec.c
index e72fb42f1d..c2fd4d7ab6 100644
--- a/libavformat/m4vdec.c
+++ b/libavformat/m4vdec.c
@@ -45,7 +45,7 @@ static int mpeg4video_probe(AVProbeData *probe_packet)
     }
 
     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)
-        return VOP+VO > 3 ? AVPROBE_SCORE_MAX/2 : AVPROBE_SCORE_MAX/4;
+        return VOP+VO > 3 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;
     return 0;
 }
 
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index c103dcebf4..ca877c3f5f 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1060,7 +1060,7 @@ static int matroska_probe(AVProbeData *p)
     }
 
     // probably valid EBML header but no recognized doctype
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
diff --git a/libavformat/mm.c b/libavformat/mm.c
index 12a11ac69d..4315802f73 100644
--- a/libavformat/mm.c
+++ b/libavformat/mm.c
@@ -79,7 +79,7 @@ static int probe(AVProbeData *p)
         return 0;
 
     /* only return half certainty since this check is a bit sketchy */
-    return AVPROBE_SCORE_MAX / 2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int read_header(AVFormatContext *s)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 3e48f15e20..a28631baf0 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2887,7 +2887,7 @@ static int mov_probe(AVProbeData *p)
                 (AV_RB32(p->buf+offset) != 1 ||
                  offset + 12 > (unsigned int)p->buf_size ||
                  AV_RB64(p->buf+offset + 8) == 0)) {
-                score = FFMAX(score, AVPROBE_SCORE_MAX - 50);
+                score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
             } else {
                 score = AVPROBE_SCORE_MAX;
             }
@@ -2907,7 +2907,7 @@ static int mov_probe(AVProbeData *p)
         case MKTAG('u','u','i','d'):
         case MKTAG('p','r','f','l'):
             /* if we only find those cause probedata is too small at least rate them */
-            score  = FFMAX(score, AVPROBE_SCORE_MAX - 50);
+            score  = FFMAX(score, AVPROBE_SCORE_EXTENSION);
             offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
             break;
         default:
diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c
index d599c9c489..644ffe4b4c 100644
--- a/libavformat/mp3dec.c
+++ b/libavformat/mp3dec.c
@@ -76,11 +76,11 @@ static int mp3_read_probe(AVProbeData *p)
     }
     // keep this in sync with ac3 probe, both need to avoid
     // issues with MPEG-files!
-    if   (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
-    else if(max_frames>200)return AVPROBE_SCORE_MAX/2;
-    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
+    if   (first_frames>=4) return AVPROBE_SCORE_EXTENSION + 1;
+    else if(max_frames>200)return AVPROBE_SCORE_EXTENSION;
+    else if(max_frames>=4) return AVPROBE_SCORE_EXTENSION / 2;
     else if(ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC) && 2*ff_id3v2_tag_len(buf0) >= p->buf_size)
-                           return AVPROBE_SCORE_MAX/8;
+                           return AVPROBE_SCORE_EXTENSION / 4;
     else if(max_frames>=1) return 1;
     else                   return 0;
 //mpegps_mp3_unrecognized_format.mpg has max_frames=3
diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c
index 73f805711d..73b7eb739c 100644
--- a/libavformat/mpc8.c
+++ b/libavformat/mpc8.c
@@ -92,7 +92,7 @@ static int mpc8_probe(AVProbeData *p)
         if (size < 2)
             return 0;
         if (bs + size - 2 >= bs_end)
-            return AVPROBE_SCORE_MAX / 4 - 1; //seems to be valid MPC but no header yet
+            return AVPROBE_SCORE_EXTENSION - 1; // seems to be valid MPC but no header yet
         if (header_found) {
             if (size < 11 || size > 28)
                 return 0;
diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index 8f835ad056..5d5b09fc07 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -89,14 +89,14 @@ static int mpegps_probe(AVProbeData *p)
     }
 
     if(vid+audio > invalid+1)     /* invalid VDR files nd short PES streams */
-        score= AVPROBE_SCORE_MAX/4;
+        score = AVPROBE_SCORE_EXTENSION / 2;
 
     if(sys>invalid && sys*9 <= pspack*10)
-        return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
+        return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
     if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
-        return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
+        return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
     if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
-        return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
+        return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2;
 
     //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
     //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
diff --git a/libavformat/mpegvideodec.c b/libavformat/mpegvideodec.c
index 471d2f4d94..a400978d02 100644
--- a/libavformat/mpegvideodec.c
+++ b/libavformat/mpegvideodec.c
@@ -63,8 +63,8 @@ static int mpegvideo_probe(AVProbeData *p)
         }
     }
     if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes && !res && slice > sicle) {
-        if(vpes) return AVPROBE_SCORE_MAX/8;
-        else     return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
+        if(vpes) return AVPROBE_SCORE_EXTENSION / 4;
+        else     return pic>1 ? AVPROBE_SCORE_EXTENSION + 1 : AVPROBE_SCORE_EXTENSION / 2; // +1 for .mpg
     }
     return 0;
 }
diff --git a/libavformat/mtv.c b/libavformat/mtv.c
index 6ffbb51ff2..2b85a2068e 100644
--- a/libavformat/mtv.c
+++ b/libavformat/mtv.c
@@ -64,13 +64,13 @@ static int mtv_probe(AVProbeData *p)
     if(!AV_RL16(&p->buf[52]) || !AV_RL16(&p->buf[54]))
     {
         if(!!AV_RL16(&p->buf[56]))
-            return AVPROBE_SCORE_MAX/2;
+            return AVPROBE_SCORE_EXTENSION;
         else
             return 0;
     }
 
     if(p->buf[51] != 16)
-        return AVPROBE_SCORE_MAX/4; // But we are going to assume 16bpp anyway ..
+        return AVPROBE_SCORE_EXTENSION / 2; // But we are going to assume 16bpp anyway ..
 
     return AVPROBE_SCORE_MAX;
 }
diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
index e582f0f6cc..21300a3d6b 100644
--- a/libavformat/nsvdec.c
+++ b/libavformat/nsvdec.c
@@ -786,7 +786,7 @@ static int nsv_probe(AVProbeData *p)
     }
     /* so we'll have more luck on extension... */
     if (av_match_ext(p->filename, "nsv"))
-        return AVPROBE_SCORE_MAX/2;
+        return AVPROBE_SCORE_EXTENSION;
     /* FIXME: add mime-type check */
     return score;
 }
diff --git a/libavformat/omadec.c b/libavformat/omadec.c
index a61f94aec4..68ab66d36f 100644
--- a/libavformat/omadec.c
+++ b/libavformat/omadec.c
@@ -433,7 +433,7 @@ static int oma_read_probe(AVProbeData *p)
     /* This check cannot overflow as tag_len has at most 28 bits */
     if (p->buf_size < tag_len + 5)
         /* EA3 header comes late, might be outside of the probe buffer */
-        return AVPROBE_SCORE_MAX / 2;
+        return AVPROBE_SCORE_EXTENSION;
 
     buf += tag_len;
 
diff --git a/libavformat/psxstr.c b/libavformat/psxstr.c
index 90c933ecd6..e7956c06e7 100644
--- a/libavformat/psxstr.c
+++ b/libavformat/psxstr.c
@@ -126,7 +126,7 @@ static int str_probe(AVProbeData *p)
     }
     /* MPEG files (like those ripped from VCDs) can also look like this;
      * only return half certainty */
-    if(vid+aud > 3)  return 50;
+    if(vid+aud > 3)  return AVPROBE_SCORE_EXTENSION;
     else if(vid+aud) return 1;
     else             return 0;
 }
diff --git a/libavformat/pva.c b/libavformat/pva.c
index ae42c8363d..9b7a40a068 100644
--- a/libavformat/pva.c
+++ b/libavformat/pva.c
@@ -49,7 +49,7 @@ static int pva_probe(AVProbeData * pd) {
 
     if (pd->buf_size >= len + 8 &&
         pva_check(buf + len) >= 0)
-        return AVPROBE_SCORE_MAX / 2;
+        return AVPROBE_SCORE_EXTENSION;
 
     return AVPROBE_SCORE_MAX / 4;
 }
diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 7b35666fd4..a1f047bd0d 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -2030,7 +2030,7 @@ static int sdp_probe(AVProbeData *p1)
     while (p < p_end && *p != '\0') {
         if (p + sizeof("c=IN IP") - 1 < p_end &&
             av_strstart(p, "c=IN IP", NULL))
-            return AVPROBE_SCORE_MAX / 2;
+            return AVPROBE_SCORE_EXTENSION;
 
         while (p < p_end - 1 && *p != '\n') p++;
         if (++p >= p_end)
diff --git a/libavformat/sierravmd.c b/libavformat/sierravmd.c
index b0b582d719..d2f2b69cd7 100644
--- a/libavformat/sierravmd.c
+++ b/libavformat/sierravmd.c
@@ -77,7 +77,7 @@ static int vmd_probe(AVProbeData *p)
         return 0;
 
     /* only return half certainty since this check is a bit sketchy */
-    return AVPROBE_SCORE_MAX / 2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int vmd_read_header(AVFormatContext *s)
diff --git a/libavformat/spdifdec.c b/libavformat/spdifdec.c
index 726a85cbe5..69843503b0 100644
--- a/libavformat/spdifdec.c
+++ b/libavformat/spdifdec.c
@@ -154,10 +154,10 @@ int ff_spdif_probe(const uint8_t *p_buf, int buf_size, enum AVCodecID *codec)
 
     if (sync_codes >= 6)
         /* good amount of sync codes but with unexpected offsets */
-        return AVPROBE_SCORE_MAX / 2;
+        return AVPROBE_SCORE_EXTENSION;
 
     /* some sync codes were found */
-    return AVPROBE_SCORE_MAX / 8;
+    return AVPROBE_SCORE_EXTENSION / 4;
 }
 
 static int spdif_read_header(AVFormatContext *s)
diff --git a/libavformat/takdec.c b/libavformat/takdec.c
index 377c10c1ab..18c2be2065 100644
--- a/libavformat/takdec.c
+++ b/libavformat/takdec.c
@@ -33,7 +33,7 @@ typedef struct TAKDemuxContext {
 static int tak_probe(AVProbeData *p)
 {
     if (!memcmp(p->buf, "tBaK", 4))
-        return AVPROBE_SCORE_MAX / 2;
+        return AVPROBE_SCORE_EXTENSION;
     return 0;
 }
 
diff --git a/libavformat/tta.c b/libavformat/tta.c
index 445389ed95..e6ded521ba 100644
--- a/libavformat/tta.c
+++ b/libavformat/tta.c
@@ -36,7 +36,7 @@ static int tta_probe(AVProbeData *p)
     const uint8_t *d = p->buf;
 
     if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
-        return 80;
+        return AVPROBE_SCORE_EXTENSION + 30;
     return 0;
 }
 
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 89a5105063..eff9373fb0 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -376,10 +376,10 @@ AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score
         if (fmt1->read_probe) {
             score = fmt1->read_probe(&lpd);
             if(fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions))
-                score = FFMAX(score, nodat ? AVPROBE_SCORE_MAX/4-1 : 1);
+                score = FFMAX(score, nodat ? AVPROBE_SCORE_EXTENSION / 2 - 1 : 1);
         } else if (fmt1->extensions) {
             if (av_match_ext(lpd.filename, fmt1->extensions)) {
-                score = 50;
+                score = AVPROBE_SCORE_EXTENSION;
             }
         }
         if (score > score_max) {
@@ -389,7 +389,7 @@ AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score
             fmt = NULL;
     }
     if(nodat)
-        score_max = FFMIN(AVPROBE_SCORE_MAX/4-1, score_max);
+        score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);
     *score_ret= score_max;
 
     return fmt;
diff --git a/libavformat/vc1test.c b/libavformat/vc1test.c
index e411a257f1..7c6bcde089 100644
--- a/libavformat/vc1test.c
+++ b/libavformat/vc1test.c
@@ -39,7 +39,7 @@ static int vc1t_probe(AVProbeData *p)
     if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC)
         return 0;
 
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int vc1t_read_header(AVFormatContext *s)
diff --git a/libavformat/vqf.c b/libavformat/vqf.c
index f1e6aafd98..ed588288b8 100644
--- a/libavformat/vqf.c
+++ b/libavformat/vqf.c
@@ -43,7 +43,7 @@ static int vqf_probe(AVProbeData *probe_packet)
     if (!memcmp(probe_packet->buf + 4, "00052200", 8))
         return AVPROBE_SCORE_MAX;
 
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static void add_metadata(AVFormatContext *s, uint32_t tag,
diff --git a/libavformat/westwood_aud.c b/libavformat/westwood_aud.c
index d66611758b..f2bd3a130e 100644
--- a/libavformat/westwood_aud.c
+++ b/libavformat/westwood_aud.c
@@ -77,7 +77,7 @@ static int wsaud_probe(AVProbeData *p)
         return 0;
 
     /* return 1/2 certainty since this file check is a little sketchy */
-    return AVPROBE_SCORE_MAX / 2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int wsaud_read_header(AVFormatContext *s)
diff --git a/libavformat/xa.c b/libavformat/xa.c
index e3d36e61b5..437de3f433 100644
--- a/libavformat/xa.c
+++ b/libavformat/xa.c
@@ -59,7 +59,7 @@ static int xa_probe(AVProbeData *p)
     if (!channels || channels > 8 || !srate || srate > 192000 ||
         bits_per_sample < 4 || bits_per_sample > 32)
         return 0;
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int xa_read_header(AVFormatContext *s)