diff --git a/dlls/winex11.drv/winpos.c b/dlls/winex11.drv/winpos.c
index 25e643e36f0..ad62236a671 100644
--- a/dlls/winex11.drv/winpos.c
+++ b/dlls/winex11.drv/winpos.c
@@ -199,6 +199,8 @@ static void update_net_wm_states( Display *display, struct x11drv_win_data *data
         new_state |= (1 << NET_WM_STATE_ABOVE);
     if (ex_style & WS_EX_TOOLWINDOW)
         new_state |= (1 << NET_WM_STATE_SKIP_TASKBAR) | (1 << NET_WM_STATE_SKIP_PAGER);
+    if (GetWindow( data->hwnd, GW_OWNER ))
+        new_state |= (1 << NET_WM_STATE_SKIP_TASKBAR);
 
     xev.xclient.type = ClientMessage;
     xev.xclient.window = data->whole_window;