diff --git a/libcxx/include/__config b/libcxx/include/__config
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -953,9 +953,9 @@
 #define _LIBCPP_WCTYPE_IS_MASK
 #endif

-#if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t)
+#if !defined(__cpp_char8_t)
 #define _LIBCPP_NO_HAS_CHAR8_T
 #endif

 // Deprecation macros.
 //