diff --git a/src/lib/common/MacOSXPrecomp.h b/src/lib/common/MacOSXPrecomp.h
index fe16821a..8cc9ff5d 100644
--- a/src/lib/common/MacOSXPrecomp.h
+++ b/src/lib/common/MacOSXPrecomp.h
@@ -20,6 +20,4 @@
 // Prefix header for all source files of the 'deleteme' target in the 'deleteme' project.
 //
 
-#define MAC_OS_X_VERSION_MAX_ALLOWED MAC_OS_X_VERSION_10_2
-
 #include <Carbon/Carbon.h>
diff --git a/src/lib/platform/OSXScreen.cpp b/src/lib/platform/OSXScreen.cpp
index a216dc1d..4719ee5c 100644
--- a/src/lib/platform/OSXScreen.cpp
+++ b/src/lib/platform/OSXScreen.cpp
@@ -44,17 +44,6 @@
 #include <AvailabilityMacros.h>
 #include <IOKit/hidsystem/event_status_driver.h>
 
-// Set some enums for fast user switching if we're building with an SDK
-// from before such support was added.
-#if !defined(MAC_OS_X_VERSION_10_3) || \
-	(MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_3)
-enum {
-	kEventClassSystem				  = 'macs',
-	kEventSystemUserSessionActivated   = 10,
-	kEventSystemUserSessionDeactivated = 11
-};
-#endif
-
 // This isn't in any Apple SDK that I know of as of yet.
 enum {
 	kSynergyEventMouseScroll = 11,