diff --git a/include/my_global.h b/include/my_global.h
index 8fb5a6b69da..feabb714004 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -621,7 +621,6 @@ C_MODE_END
 */
 #define _VARARGS(X) X
 #define _STATIC_VARARGS(X) X
-#define _PC(X)	X
 
 /* The DBUG_ON flag always takes precedence over default DBUG_OFF */
 #if defined(DBUG_ON) && defined(DBUG_OFF)