diff --git a/A2Mac.xcodeproj/project.pbxproj b/A2Mac.xcodeproj/project.pbxproj
index 3bfc0bc..8b4d885 100644
--- a/A2Mac.xcodeproj/project.pbxproj
+++ b/A2Mac.xcodeproj/project.pbxproj
@@ -1202,7 +1202,7 @@
 					"-DINTERRUPT_CHECK_PER_STEP",
 					"-DCLK_ABSOLUTE_PRECISE",
 				);
-				OTHER_SWIFT_FLAGS = "-DHIRES -D_NO_HIRESDRAW -D_NO_HIRESLOW -DHIRESLOWCOLOR";
+				OTHER_SWIFT_FLAGS = "-DHIRES -DMETAL_NO -DHIRESDRAW -D_NO_HIRESLOW -DHIRESLOWCOLOR";
 				PRODUCT_BUNDLE_IDENTIFIER = com.gamealloy.A2Mac;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
@@ -1238,7 +1238,7 @@
 					"-DINTERRUPT_CHECK_PER_STEP",
 					"-DCLK_ABSOLUTE_PRECISE",
 				);
-				OTHER_SWIFT_FLAGS = "-DHIRES -D_NO_HIRESDRAW -D_NO_HIRESLOW -DHIRESLOWCOLOR";
+				OTHER_SWIFT_FLAGS = "-DHIRES -DMETAL_NO -DHIRESDRAW -D_NO_HIRESLOW -DHIRESLOWCOLOR";
 				PRODUCT_BUNDLE_IDENTIFIER = com.gamealloy.A2Mac;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "A2Mac/A2Mac-Bridging-Header.h";