diff --git a/BasiliskII/src/MacOSX/BasiliskII.xcodeproj/project.pbxproj b/BasiliskII/src/MacOSX/BasiliskII.xcodeproj/project.pbxproj
index a7db92db..faec22df 100644
--- a/BasiliskII/src/MacOSX/BasiliskII.xcodeproj/project.pbxproj
+++ b/BasiliskII/src/MacOSX/BasiliskII.xcodeproj/project.pbxproj
@@ -945,7 +945,7 @@
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"$(inherited)",
 					HAVE_CONFIG_H,
-					DEBUG,
+					"DEBUG=1",
 				);
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;