diff --git a/reactos/dll/win32/kernel32/misc/lcformat.c b/reactos/dll/win32/kernel32/misc/lcformat.c
index 5cce484333f..2cbabe8fa5e 100644
--- a/reactos/dll/win32/kernel32/misc/lcformat.c
+++ b/reactos/dll/win32/kernel32/misc/lcformat.c
@@ -1587,7 +1587,7 @@ GetCurrencyFormatW_Error:
 
     dwState |= NF_DIGITS_OUT;
     dwCurrentGroupCount++;
-    if (szSrc >= lpszValue && dwCurrentGroupCount == dwGroupCount)
+    if (szSrc >= lpszValue && dwCurrentGroupCount == dwGroupCount && *szSrc != '-')
     {
       LPWSTR lpszGrp = lpFormat->lpThousandSep + strlenW(lpFormat->lpThousandSep) - 1;