diff --git a/libavcodec/mpeg12decdata.h b/libavcodec/mpeg12decdata.h
index 323a90233618972264b06768044eb8a887f4461e..1c71bd90b95cfdb7c25cbb2f9266f19df47a7716 100644
--- a/libavcodec/mpeg12decdata.h
+++ b/libavcodec/mpeg12decdata.h
@@ -33,7 +33,6 @@
 
 
 #define MB_TYPE_ZERO_MV   0x20000000
-#define IS_ZERO_MV(a)   ((a)&MB_TYPE_ZERO_MV)
 
 static const uint8_t table_mb_ptype[7][2] = {
     { 3, 5 }, // 0x01 MB_INTRA