diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index aea2c34b25..a2320ad405 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -57,7 +57,7 @@ enum OutputFormat {
 #define QMAT_SHIFT 21
 
 #define MAX_FCODE 7
-#define MAX_MV 2048
+#define MAX_MV 4096
 
 #define MAX_THREADS 32
 #define MAX_PICTURE_COUNT 36