diff --git a/src/include/units/bits/external/hacks.h b/src/include/units/bits/external/hacks.h
index 2eef7ba8..adae44f2 100644
--- a/src/include/units/bits/external/hacks.h
+++ b/src/include/units/bits/external/hacks.h
@@ -60,7 +60,7 @@ namespace std {
 template<class T>
 concept default_constructible = constructible_from<T>;
 
-#elif !COMP_CLANG
+#elif COMP_CLANG && false
 
 // concepts
 using concepts::three_way_comparable;