diff --git a/reactos/dll/win32/user32/windows/defwnd.c b/reactos/dll/win32/user32/windows/defwnd.c
index b8c756d891b..5f2cd550df8 100644
--- a/reactos/dll/win32/user32/windows/defwnd.c
+++ b/reactos/dll/win32/user32/windows/defwnd.c
@@ -1268,7 +1268,8 @@ User32DefWindowProc(HWND hWnd,
         case WM_SHOWWINDOW:
         {
             LONG Style;
-
+            INT Ret = 0;
+            
             if (!lParam)
                 return 0;
             Style = GetWindowLongW(hWnd, GWL_STYLE);
@@ -1280,8 +1281,13 @@ User32DefWindowProc(HWND hWnd,
                 return 0;
             if (!GetWindow(hWnd, GW_OWNER))
                 return 0;
-            NtUserCallTwoParam((DWORD) hWnd, (DWORD) wParam, TWOPARAM_ROUTINE_ROS_SHOWWINDOW);
-            ShowWindow(hWnd, wParam ? SW_SHOWNA : SW_HIDE);
+            Ret = NtUserCallTwoParam((DWORD) hWnd, (DWORD) wParam, TWOPARAM_ROUTINE_ROS_SHOWWINDOW);
+            if(Ret)
+            {
+                if( Ret == -1) return 0;
+                return Ret;
+            }
+            ShowWindow(hWnd, wParam ? SW_SHOWNOACTIVATE : SW_HIDE);
             break;
         }