diff --git a/reactos/lib/syssetup/wizard.c b/reactos/lib/syssetup/wizard.c
index b52f93b8282..373b22cc05b 100644
--- a/reactos/lib/syssetup/wizard.c
+++ b/reactos/lib/syssetup/wizard.c
@@ -1570,7 +1570,7 @@ ProcessPageDlgProc(HWND hwndDlg,
       case WM_NOTIFY:
         {
           LPNMHDR lpnm = (LPNMHDR)lParam;
-          ULONG MaxProgress;
+          ULONG MaxProgress = 0;
 
           switch (lpnm->code)
             {