diff --git "a/dll/win32/syssetup/wizard.c" "b/dll/win32/syssetup/wizard.c"
index 14c282091be..64cb52db0b2 100644
--- "a/dll/win32/syssetup/wizard.c"
+++ "b/dll/win32/syssetup/wizard.c"
@@ -1446,7 +1446,7 @@ LocalePageDlgProc(HWND hwndDlg,
                         break;
 
                     case IDC_CUSTOMLAYOUT:
-                        RunControlPanelApplet(hwndDlg, L"input.dll,@1");
+                        RunControlPanelApplet(hwndDlg, L"input.dll,,@1");
                         SetKeyboardLayoutName(GetDlgItem(hwndDlg, IDC_LAYOUTTEXT));
                         break;
                 }