diff --git a/stepmania/PBProject/stepmania.pbproj/project.pbxproj b/stepmania/PBProject/stepmania.pbproj/project.pbxproj
index 6814551d57..d2a4d62563 100755
--- a/stepmania/PBProject/stepmania.pbproj/project.pbxproj
+++ b/stepmania/PBProject/stepmania.pbproj/project.pbxproj
@@ -6898,6 +6898,10 @@
 				CONFIGURATION_BUILD_DIR = "$(BUILD_DIR)/$(CONFIGURATION)";
 				GCC_ENABLE_FIX_AND_CONTINUE = YES;
 				GCC_MODEL_TUNING = G5;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"$(value)",
+					LUA_USE_MACOSX,
+				);
 				INSTALL_PATH = /usr/local/lib;
 				PREBINDING = NO;
 				PRODUCT_NAME = "lua-5.1";
@@ -6911,6 +6915,10 @@
 				CONFIGURATION_BUILD_DIR = "$(BUILD_DIR)/$(CONFIGURATION)";
 				GCC_ENABLE_FIX_AND_CONTINUE = YES;
 				GCC_MODEL_TUNING = G5;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"$(value)",
+					LUA_USE_MACOSX,
+				);
 				INSTALL_PATH = /usr/local/lib;
 				PRODUCT_NAME = "lua-5.1";
 			};
@@ -6926,6 +6934,10 @@
 				GCC_GENERATE_DEBUGGING_SYMBOLS = YES;
 				GCC_MODEL_TUNING = G5;
 				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"$(value)",
+					LUA_USE_MACOSX,
+				);
 				INSTALL_PATH = /usr/local/lib;
 				PREBINDING = NO;
 				PRODUCT_NAME = "lua-5.1";