diff --git a/stl/inc/cctype b/stl/inc/cctype
index cc6c49fe7b3..597de07b05a 100644
--- a/stl/inc/cctype
+++ b/stl/inc/cctype
@@ -18,22 +18,6 @@ _STL_DISABLE_CLANG_WARNINGS
 #pragma push_macro("new")
 #undef new
 
-// remove any (improper) macro overrides
-#undef isalnum
-#undef isalpha
-#undef isblank
-#undef iscntrl
-#undef isdigit
-#undef isgraph
-#undef islower
-#undef isprint
-#undef ispunct
-#undef isspace
-#undef isupper
-#undef isxdigit
-#undef tolower
-#undef toupper
-
 _STD_BEGIN
 using _CSTD isalnum;
 using _CSTD isalpha;