diff --git a/utils/generate_feature_test_macro_components.py b/utils/generate_feature_test_macro_components.py
index d923208a1..c11846ec6 100755
--- a/utils/generate_feature_test_macro_components.py
+++ b/utils/generate_feature_test_macro_components.py
@@ -865,7 +865,7 @@ def produce_tests():
 
 #endif // TEST_STD_VER > 17
 
-int main(int, char**) { return 0; }
+int main(int, char**) {{ return 0; }}
 """.format(script_name=script_name,
            header=h,
            test_tags=test_tags,