diff --git a/src/os_mac.h b/src/os_mac.h
index 9546b6d36e..78b79c2e16 100644
--- a/src/os_mac.h
+++ b/src/os_mac.h
@@ -16,11 +16,6 @@
 # define OPAQUE_TOOLBOX_STRUCTS 0
 #endif
 
-/* Include MAC_OS_X_VERSION_* macros (needed for OS X 10.9, should be supported
- * as of OS X 10.2)
- * */
-#include <AvailabilityMacros.h>
-
 /*
  * Macintosh machine-dependent things.
  *