diff --git a/libavformat/mov.c b/libavformat/mov.c
index d0dbef62af..f4ba5e243f 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1166,7 +1166,7 @@ static int mov_read_stsz(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
 
     num_bytes = (entries*field_size+4)>>3;
 
-    buf = av_malloc(num_bytes);
+    buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);
     if (!buf) {
         av_freep(&sc->sample_sizes);
         return AVERROR(ENOMEM);