diff --git a/libcxx/include/__locale b/libcxx/include/__locale
--- a/libcxx/include/__locale
+++ b/libcxx/include/__locale
@@ -1412,7 +1412,7 @@
             if (__r == codecvt_base::error || __nn == __nb)
                 __throw_runtime_error("locale not supported");
             for (const char16_t* __p = __buf; __p < __bn; ++__p, ++__s)
-                *__s = (wchar_t)*__p;
+                *__s = *__p;
             __nb = __nn;
         }
         return __s;
@@ -1446,7 +1446,7 @@
             if (__r == codecvt_base::error || __nn == __nb)
                 __throw_runtime_error("locale not supported");
             for (const char32_t* __p = __buf; __p < __bn; ++__p, ++__s)
-                *__s = (wchar_t)*__p;
+                *__s = *__p;
             __nb = __nn;
         }
         return __s;