diff --git a/include/my_global.h b/include/my_global.h
index 31bcb771c4d..5c07aa00b32 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -527,7 +527,6 @@ C_MODE_END
 */
 #define _VARARGS(X) X
 #define _STATIC_VARARGS(X) X
-#define _PC(X)	X
 
 #if defined(DBUG_ON) && defined(DBUG_OFF)
 #undef DBUG_OFF