diff --git a/libavcodec/mmvideo.c b/libavcodec/mmvideo.c
index f52bf3ada2..00284c9a04 100644
--- a/libavcodec/mmvideo.c
+++ b/libavcodec/mmvideo.c
@@ -127,7 +127,7 @@ static int mm_decode_intra(MmContext * s, int half_horiz, int half_vert)
  */
 static int mm_decode_inter(MmContext * s, int half_horiz, int half_vert)
 {
-    int data_off = bytestream2_get_le16(&s->gb), y;
+    int data_off = bytestream2_get_le16(&s->gb), y = 0;
     GetByteContext data_ptr;
 
     if (bytestream2_get_bytes_left(&s->gb) < data_off)