diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 89110210d7..3463ac6b3a 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -734,7 +734,7 @@ static int mov_write_stbl_tag(ByteIOContext *pb, MOVTrack* track)
     mov_write_stsd_tag(pb, track);
     mov_write_stts_tag(pb, track);
     if (track->enc->codec_type == CODEC_TYPE_VIDEO &&
-        track->hasKeyframes < track->entry)
+        track->hasKeyframes && track->hasKeyframes < track->entry)
         mov_write_stss_tag(pb, track);
     if (track->enc->codec_type == CODEC_TYPE_VIDEO &&
         track->hasBframes)