diff --git a/SetAppAffinity.xcodeproj/project.pbxproj b/SetAppAffinity.xcodeproj/project.pbxproj
index 23eb1c1..2cc839b 100644
--- a/SetAppAffinity.xcodeproj/project.pbxproj
+++ b/SetAppAffinity.xcodeproj/project.pbxproj
@@ -181,6 +181,7 @@
 			buildSettings = {
 				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
 				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_ENABLE_OBJC_GC = required;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
@@ -195,6 +196,7 @@
 			buildSettings = {
 				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
 				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_ENABLE_OBJC_GC = required;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				PREBINDING = NO;