diff --git a/UnitTests/UnitTests.xcodeproj/project.pbxproj b/UnitTests/UnitTests.xcodeproj/project.pbxproj
index fedf498b6..e829f67e0 100644
--- a/UnitTests/UnitTests.xcodeproj/project.pbxproj
+++ b/UnitTests/UnitTests.xcodeproj/project.pbxproj
@@ -205,7 +205,7 @@
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CLANG_CXX_LANGUAGE_STANDARD = "c++17";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_ENABLE_OBJC_WEAK = YES;
@@ -265,7 +265,7 @@
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CLANG_CXX_LANGUAGE_STANDARD = "c++17";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_ENABLE_OBJC_WEAK = YES;