diff --git a/GCDWebServer.xcodeproj/project.pbxproj b/GCDWebServer.xcodeproj/project.pbxproj
index c73b841..e358bba 100644
--- a/GCDWebServer.xcodeproj/project.pbxproj
+++ b/GCDWebServer.xcodeproj/project.pbxproj
@@ -513,6 +513,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_OBJC_ARC = YES;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = "DEBUG=1";
 				GCC_PREPROCESSOR_DEFINITIONS_NOT_USED_IN_PRECOMPS = __GCDWEBSERVER_ENABLE_TESTING__;
@@ -543,6 +544,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_OBJC_ARC = YES;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_PREPROCESSOR_DEFINITIONS_NOT_USED_IN_PRECOMPS = __GCDWEBSERVER_ENABLE_TESTING__;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
 				HEADER_SEARCH_PATHS = "$(SDKROOT)/usr/include/libxml2";