diff --git a/libavformat/mpjpegdec.c b/libavformat/mpjpegdec.c
index 7a6bbe491b..9d539bbf53 100644
--- a/libavformat/mpjpegdec.c
+++ b/libavformat/mpjpegdec.c
@@ -124,7 +124,7 @@ static int mpjpeg_read_probe(AVProbeData *p)
     if (!pb)
         return 0;
 
-    ret = (parse_multipart_header(pb, &size, "--", NULL) > 0) ? AVPROBE_SCORE_MAX : 0;
+    ret = (parse_multipart_header(pb, &size, "--", NULL) >= 0) ? AVPROBE_SCORE_MAX : 0;
 
     av_free(pb);