diff --git a/FL/mac.H b/FL/mac.H
index 818ea3467..b0a2b84f5 100644
--- a/FL/mac.H
+++ b/FL/mac.H
@@ -47,10 +47,6 @@ typedef class FLWindow *Window; // pointer to the FLWindow objective-c class
 // Standard MacOS C/C++ includes...
 #include <ApplicationServices/ApplicationServices.h>
 #undef check // because of Fl::check()
-#ifdef   __MAC_OS_X_VERSION_MAX_ALLOWED
-#  undef   MAC_OS_X_VERSION_MAX_ALLOWED
-#  define  MAC_OS_X_VERSION_MAX_ALLOWED  __MAC_OS_X_VERSION_MAX_ALLOWED
-#endif
 
 #ifndef MAC_OS_X_VERSION_10_4
 #define MAC_OS_X_VERSION_10_4 1040