diff --git a/libavformat/segafilm.c b/libavformat/segafilm.c
index a56568c300..8a0e8bc3c6 100644
--- a/libavformat/segafilm.c
+++ b/libavformat/segafilm.c
@@ -69,6 +69,9 @@ static int film_probe(AVProbeData *p)
     if (AV_RB32(&p->buf[0]) != FILM_TAG)
         return 0;
 
+    if (AV_RB32(&p->buf[16]) != FDSC_TAG)
+        return 0;
+
     return AVPROBE_SCORE_MAX;
 }