diff --git a/include/zinnia/compiler.h b/include/zinnia/compiler.h
index b253792..f325788 100644
--- a/include/zinnia/compiler.h
+++ b/include/zinnia/compiler.h
@@ -14,18 +14,10 @@
 #define __format(like, ...) gnu::format(like, __VA_ARGS__)
 #define __always_inline     gnu::always_inline
 #define __visibility        gnu::visibility
-
-// TODO: Workaround for clang which doesn't have these C23 standard attributes yet.
-#if !__has_c_attribute(unsequenced)
-#define unsequenced gnu::const
-#endif
-
-#if !__has_c_attribute(reproducible)
-#define reproducible gnu::pure
-#endif
+#define __pure              gnu::pure
 
 // Only clang has these hints, GCC would throw a warning here.
-// clang::noderef also don't support the C23 attribute format.
+// clang::noderef also doesn't support the C23 attribute format.
 #ifdef __clang__
 #define __user __attribute__((noderef, address_space(1)))
 #define __phys __attribute__((noderef, address_space(2)))