diff --git a/reactos/include/crt/string.h b/reactos/include/crt/string.h
index 219bf0e4031..ef659029c84 100644
--- a/reactos/include/crt/string.h
+++ b/reactos/include/crt/string.h
@@ -357,6 +357,7 @@ extern "C" {
     _In_opt_ _locale_t _Locale);
 
   char*
+  __cdecl
   strncpy(
     char *_Dest,
     const char *_Source,
@@ -707,6 +708,7 @@ extern "C" {
   _CRTIMP
   _CRT_INSECURE_DEPRECATE(wcsncpy_s)
   wchar_t*
+  __cdecl
   wcsncpy(
     wchar_t *_Dest,
     const wchar_t *_Source,