diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index 0ee16313af..c431b97019 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -350,7 +350,7 @@ static int alloc_sequence_buffers(DiracContext *s)
     s->blmotion = av_malloc(sbwidth * sbheight * 16 * sizeof(*s->blmotion));
     s->edge_emu_buffer_base = av_malloc((w+64)*MAX_BLOCKSIZE);
 
-    s->mctmp     = av_malloc((w+64+MAX_BLOCKSIZE) * (h*MAX_BLOCKSIZE) * sizeof(*s->mctmp));
+    s->mctmp     = av_malloc((w+64+MAX_BLOCKSIZE) * (h+MAX_BLOCKSIZE) * sizeof(*s->mctmp));
     s->mcscratch = av_malloc((w+64)*MAX_BLOCKSIZE);
 
     if (!s->sbsplit || !s->blmotion || !s->mctmp || !s->mcscratch)