diff --git a/libavformat/mov.c b/libavformat/mov.c
index 11526346be..c4d3863de9 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -3516,6 +3516,9 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
     } else {
         unsigned chunk_samples, total = 0;
 
+        if (!sc->chunk_count)
+            return;
+
         // compute total chunk count
         for (i = 0; i < sc->stsc_count; i++) {
             unsigned count, chunk_count;