diff --git a/stepmania/src/archutils/Darwin/arch_setup.h b/stepmania/src/archutils/Darwin/arch_setup.h
index bd90dded01..e27abe9eb3 100644
--- a/stepmania/src/archutils/Darwin/arch_setup.h
+++ b/stepmania/src/archutils/Darwin/arch_setup.h
@@ -39,9 +39,6 @@ extern "C" int SM_main( int argc, char *argv[] );
 #ifndef MACOSX
 # define MACOSX
 #endif
-#ifndef __MACOSX__
-# define __MACOSX__
-#endif
 
 #define ArchSwap32(n) OSSwapInt32((n))
 #define ArchSwap24(n) (ArchSwap32((n)) >> 8)