diff --git a/panel/panel-window.c b/panel/panel-window.c
index 4d7924c..fc3228a 100644
--- a/panel/panel-window.c
+++ b/panel/panel-window.c
@@ -913,6 +913,12 @@ panel_window_leave_notify_event (GtkWidget        *widget,
 {
   PanelWindow *window = PANEL_WINDOW (widget);
 
+   /* simulate a geometry change to check for overlapping windows */
+  if (window->autohide_behavior == AUTOHIDE_BEHAVIOR_INTELLIGENTLY) {
+    panel_window_active_window_geometry_changed (window->wnck_active_window, window);
+    return (*GTK_WIDGET_CLASS (panel_window_parent_class)->leave_notify_event) (widget, event);
+  }
+
    /* queue an autohide timeout if needed */
   if (event->detail != GDK_NOTIFY_INFERIOR
       && window->autohide_state != AUTOHIDE_DISABLED