diff --git a/TrustKit.xcodeproj/project.pbxproj b/TrustKit.xcodeproj/project.pbxproj
index 7666af55..2a6989dd 100644
--- a/TrustKit.xcodeproj/project.pbxproj
+++ b/TrustKit.xcodeproj/project.pbxproj
@@ -1508,7 +1508,7 @@
 					"DEBUG=1",
 					"$(inherited)",
 				);
-				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
+				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
@@ -1569,7 +1569,7 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
+				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;