diff --git a/source/Irrlicht/Irrlicht.xcodeproj/project.pbxproj b/source/Irrlicht/Irrlicht.xcodeproj/project.pbxproj
index 72254d2b..671d01ce 100644
--- a/source/Irrlicht/Irrlicht.xcodeproj/project.pbxproj
+++ b/source/Irrlicht/Irrlicht.xcodeproj/project.pbxproj
@@ -2489,7 +2489,10 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				DEPLOYMENT_LOCATION = YES;
 				ENABLE_TESTABILITY = YES;
-				"GCC_PREPROCESSOR_DEFINITIONS[arch=*]" = "DEBUG=1";
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"PNG_ARM_NEON_OPT=0",
+				);
 				INSTALL_PATH = /;
 				MACOSX_DEPLOYMENT_TARGET = 10.7;
 				ONLY_ACTIVE_ARCH = YES;
@@ -2506,7 +2509,10 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "c++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				DEPLOYMENT_LOCATION = YES;
-				"GCC_PREPROCESSOR_DEFINITIONS[arch=*]" = "NDEBUG=1";
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"NDEBUG=1",
+					"PNG_ARM_NEON_OPT=0",
+				);
 				INSTALL_PATH = /;
 				MACOSX_DEPLOYMENT_TARGET = 10.7;
 				OTHER_CPLUSPLUSFLAGS = (