diff --git a/Lex/Preprocessor.cpp b/Lex/Preprocessor.cpp
index 0d3ac52..718b476 100644
--- a/Lex/Preprocessor.cpp
+++ b/Lex/Preprocessor.cpp
@@ -382,7 +382,7 @@
   
   // Compiler set macros.
   DefineBuiltinMacro(Buf, "__APPLE_CC__=5250");
-  DefineBuiltinMacro(Buf, "__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__=1030");
+  DefineBuiltinMacro(Buf, "__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__=1050");
   DefineBuiltinMacro(Buf, "__GNUC_MINOR__=0");
   DefineBuiltinMacro(Buf, "__GNUC_PATCHLEVEL__=1");
   DefineBuiltinMacro(Buf, "__GNUC__=4");