diff --git a/reactos/dll/cpl/input/add.c b/reactos/dll/cpl/input/add.c
index e7e357a7880..690525f8bed 100644
--- a/reactos/dll/cpl/input/add.c
+++ b/reactos/dll/cpl/input/add.c
@@ -221,7 +221,7 @@ LanguagesEnumProc(LPTSTR lpLanguage)
 
     Lcid = _tcstoul(lpLanguage, NULL, 16);
 
-    GetLocaleInfo(Lcid, LOCALE_SLANGUAGE, Lang, sizeof(Lang));
+    GetLocaleInfo(Lcid, LOCALE_SLANGUAGE, Lang, sizeof(Lang) / sizeof(Lang[0]));
     Index = (INT)SendMessage(hLangList, CB_ADDSTRING,
                              0, (LPARAM)Lang);