diff --git a/mac_build/boinc.xcodeproj/project.pbxproj b/mac_build/boinc.xcodeproj/project.pbxproj
index 36fc22289a..790ffd3a8e 100644
--- a/mac_build/boinc.xcodeproj/project.pbxproj
+++ b/mac_build/boinc.xcodeproj/project.pbxproj
@@ -4417,6 +4417,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_CXX_LANGUAGE_STANDARD = "c++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				COPY_PHASE_STRIP = YES;
 				DEAD_CODE_STRIPPING = YES;
@@ -4591,6 +4592,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_CXX_LANGUAGE_STANDARD = "c++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";