diff --git a/reactos/include/psdk/winnls.h b/reactos/include/psdk/winnls.h
index c092f083692..cfdbd14f3bf 100644
--- a/reactos/include/psdk/winnls.h
+++ b/reactos/include/psdk/winnls.h
@@ -598,6 +598,8 @@ int WINAPI SetCalendarInfoW(LCID,CALID,CALTYPE,LPCWSTR);
 BOOL WINAPI SetLocaleInfoA(LCID,LCTYPE,LPCSTR);
 BOOL WINAPI SetLocaleInfoW(LCID,LCTYPE,LPCWSTR);
 BOOL WINAPI SetThreadLocale(LCID);
+BOOL WINAPI SetUserDefaultLCID(LCID);
+BOOL WINAPI SetUserDefaultUILanguage(LANGID);
 BOOL WINAPI SetUserGeoID(GEOID);
 int WINAPI WideCharToMultiByte(UINT,DWORD,LPCWSTR,int,LPSTR,int,LPCSTR,LPBOOL);
 #if (WINVER >= 0x0500)