diff --git a/libavformat/mov.c b/libavformat/mov.c
index 92d90dbb30..471b6ca0ae 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -3428,7 +3428,7 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     int64_t dts;
     int data_offset = 0;
     unsigned entries, first_sample_flags = frag->flags;
-    int flags, distance, i, found_keyframe = 0, err;
+    int flags, distance, i, err;
 
     for (i = 0; i < c->fc->nb_streams; i++) {
         if (c->fc->streams[i]->id == frag->track_id) {
@@ -3515,8 +3515,8 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         sc->ctts_count++;
         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
             keyframe = 1;
-        else if (!found_keyframe)
-            keyframe = found_keyframe =
+        else
+            keyframe =
                 !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |
                                   MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));
         if (keyframe)