diff --git a/src/cdrom/macosx/AudioFilePlayer.h b/src/cdrom/macosx/AudioFilePlayer.h
index b4f4d3493..f68b5a494 100644
--- a/src/cdrom/macosx/AudioFilePlayer.h
+++ b/src/cdrom/macosx/AudioFilePlayer.h
@@ -37,8 +37,7 @@
 #include <AudioUnit/AUNTComponent.h>
 #endif
 
-/* This typedef is included in the 10.5+ SDK headers. */
-#ifndef MAC_OS_X_VERSION_10_5
+#if (MAC_OS_X_VERSION_MAX_ALLOWED <= 1050)
 typedef SInt16 FSIORefNum;
 #endif
 
diff --git a/src/video/quartz/SDL_QuartzWindow.h b/src/video/quartz/SDL_QuartzWindow.h
index cd890a48b..5acf6d1bb 100644
--- a/src/video/quartz/SDL_QuartzWindow.h
+++ b/src/video/quartz/SDL_QuartzWindow.h
@@ -21,8 +21,7 @@
 */
 #include "SDL_config.h"
 
-/* this is defined in the 10.5+ SDK headers
-#ifndef MAC_OS_X_VERSION_10_5
+#if (MAC_OS_X_VERSION_MAX_ALLOWED < 1050)
 typedef unsigned int NSUInteger;
 #endif