diff --git a/reactos/subsystems/win32/win32k/ntuser/winpos.c b/reactos/subsystems/win32/win32k/ntuser/winpos.c
index 0570f717650..ea11ccea70b 100644
--- a/reactos/subsystems/win32/win32k/ntuser/winpos.c
+++ b/reactos/subsystems/win32/win32k/ntuser/winpos.c
@@ -1022,7 +1022,11 @@ co_WinPosSetWindowPos(
          if (InsertAfterWindow != NULL)
             UserDereferenceObject(InsertAfterWindow);
          if ((HWND_TOPMOST == WinPos.hwndInsertAfter)
-             && (IntIsDesktopWindow(Window->Parent)))
+               || (0 != (Window->Wnd->ExStyle & WS_EX_TOPMOST)
+                   && NULL != Window->PrevSibling
+                   && 0 != (Window->PrevSibling->Wnd->ExStyle & WS_EX_TOPMOST))
+               || (NULL != Window->NextSibling
+                   && 0 != (Window->NextSibling->Wnd->ExStyle & WS_EX_TOPMOST)))
          {
             Window->Wnd->ExStyle |= WS_EX_TOPMOST;
          }