diff --git a/reactos/include/crt/tchar.h b/reactos/include/crt/tchar.h
index 0b5011eadd0..d7c31478341 100644
--- a/reactos/include/crt/tchar.h
+++ b/reactos/include/crt/tchar.h
@@ -624,9 +624,7 @@ extern "C" {
 #define _tcscpy_s strcpy_s
 #define _tcsdup _strdup
 #define _tcslen strlen
-#if 0
 #define _tcsnlen strnlen
-#endif
 #define _tcsxfrm strxfrm
 #define _tcsxfrm_l _strxfrm_l
 #define _tcserror strerror