diff --git a/win32ss/user/winsrv/consrv/frontends/wcwidth.c b/win32ss/user/winsrv/consrv/frontends/wcwidth.c
index 61e822ad679..6a39b02a2a6 100644
--- a/win32ss/user/winsrv/consrv/frontends/wcwidth.c
+++ b/win32ss/user/winsrv/consrv/frontends/wcwidth.c
@@ -198,9 +198,13 @@ int mk_wcwidth(wchar_t ucs)
       (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
       (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
       (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
-      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
+      (ucs >= 0xffe0 && ucs <= 0xffe6)
+#if !defined(__REACTOS__) || (defined(WCHAR_MAX) && (WCHAR_MAX >= 0x10000))
+                                       ||
       (ucs >= 0x20000 && ucs <= 0x2fffd) ||
-      (ucs >= 0x30000 && ucs <= 0x3fffd)));
+      (ucs >= 0x30000 && ucs <= 0x3fffd)
+#endif
+                                        ));
 }