diff --git a/libavformat/gxfenc.c b/libavformat/gxfenc.c
index 7495924722..9ea24c2f27 100644
--- a/libavformat/gxfenc.c
+++ b/libavformat/gxfenc.c
@@ -137,7 +137,7 @@ static void gxf_write_padding(AVIOContext *pb, int64_t to_pad)
     ffio_fill(pb, 0, to_pad);
 }
 
-static int64_t updatePacketSize(AVIOContext *pb, int64_t pos)
+static int64_t update_packet_size(AVIOContext *pb, int64_t pos)
 {
     int64_t curpos;
     int size;
@@ -154,7 +154,7 @@ static int64_t updatePacketSize(AVIOContext *pb, int64_t pos)
     return curpos - pos;
 }
 
-static int64_t updateSize(AVIOContext *pb, int64_t pos)
+static int64_t update_size(AVIOContext *pb, int64_t pos)
 {
     int64_t curpos;
 
@@ -300,7 +300,7 @@ static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc,
     avio_w8(pb, 4);
     avio_wb32(pb, sc->fields);
 
-    return updateSize(pb, pos);
+    return update_size(pb, pos);
 }
 
 static int gxf_write_material_data_section(AVFormatContext *s)
@@ -351,7 +351,7 @@ static int gxf_write_material_data_section(AVFormatContext *s)
     avio_w8(pb, 4);
     avio_wb32(pb, avio_size(pb) / 1024);
 
-    return updateSize(pb, pos);
+    return update_size(pb, pos);
 }
 
 static int gxf_write_track_description_section(AVFormatContext *s)
@@ -368,7 +368,7 @@ static int gxf_write_track_description_section(AVFormatContext *s)
 
     gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
 
-    return updateSize(pb, pos);
+    return update_size(pb, pos);
 }
 
 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
@@ -400,7 +400,7 @@ static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
     gxf_write_material_data_section(s);
     gxf_write_track_description_section(s);
 
-    return updatePacketSize(pb, pos);
+    return update_packet_size(pb, pos);
 }
 
 static int gxf_write_flt_packet(AVFormatContext *s)
@@ -424,7 +424,7 @@ static int gxf_write_flt_packet(AVFormatContext *s)
 
     ffio_fill(pb, 0, (1000 - i) * 4);
 
-    return updatePacketSize(pb, pos);
+    return update_packet_size(pb, pos);
 }
 
 static int gxf_write_umf_material_description(AVFormatContext *s)
@@ -643,7 +643,7 @@ static int gxf_write_umf_packet(AVFormatContext *s)
     gxf->umf_track_size = gxf_write_umf_track_description(s);
     gxf->umf_media_size = gxf_write_umf_media_description(s);
     gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
-    return updatePacketSize(pb, pos);
+    return update_packet_size(pb, pos);
 }
 
 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
@@ -823,7 +823,7 @@ static int gxf_write_eos_packet(AVIOContext *pb)
     int64_t pos = avio_tell(pb);
 
     gxf_write_packet_header(pb, PKT_EOS);
-    return updatePacketSize(pb, pos);
+    return update_packet_size(pb, pos);
 }
 
 static int gxf_write_trailer(AVFormatContext *s)
@@ -956,7 +956,7 @@ static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
         gxf->nb_fields += 2; // count fields
     }
 
-    updatePacketSize(pb, pos);
+    update_packet_size(pb, pos);
 
     gxf->packet_count++;
     if (gxf->packet_count == 100) {