diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index cf94e32ce9..8c869ede60 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -3416,7 +3416,8 @@ static int mov_write_trun_tag(AVIOContext *pb, MOVMuxContext *mov,
         if (i > 0 && get_sample_flags(track, &track->cluster[i]) != track->default_sample_flags)
             flags |= MOV_TRUN_SAMPLE_FLAGS;
     }
-    if (!(flags & MOV_TRUN_SAMPLE_FLAGS))
+    if (!(flags & MOV_TRUN_SAMPLE_FLAGS) && track->entry > 0 &&
+         get_sample_flags(track, &track->cluster[0]) != track->default_sample_flags)
         flags |= MOV_TRUN_FIRST_SAMPLE_FLAGS;
     if (track->flags & MOV_TRACK_CTTS)
         flags |= MOV_TRUN_SAMPLE_CTS;
diff --git a/tests/ref/fate/sub-movtextenc b/tests/ref/fate/sub-movtextenc
index a44065c846..9b08b2121a 100644
--- a/tests/ref/fate/sub-movtextenc
+++ b/tests/ref/fate/sub-movtextenc
@@ -1 +1 @@
-930cfa0d91434f46a8a197a2165a734a
+eacd7d65ec75c5520f5108b0a885a995