diff --git a/reactos/dll/cpl/intl/currency.c b/reactos/dll/cpl/intl/currency.c
index b9d9868b247..9e81f6c2ff9 100644
--- a/reactos/dll/cpl/intl/currency.c
+++ b/reactos/dll/cpl/intl/currency.c
@@ -413,7 +413,8 @@ SetCurrencyDigNum(HWND hwndDlg, LCID lcid)
                            (LPARAM)0);
 
     /* Save number of digidts in field */
-    SetLocaleInfo(lcid, LOCALE_SMONGROUPING, szFieldDigNumSamples[nCurrSel]);
+    if (nCurrSel > 0)
+        SetLocaleInfo(lcid, LOCALE_SMONGROUPING, szFieldDigNumSamples[nCurrSel]);
 
     return TRUE;
 }