src/java.desktop/unix/classes/sun/awt/X11/XFramePeer.java

@@ -287,11 +287,11 @@
                 stateLog.finer("DeIconifying " + this);
             }
 
             XNETProtocol net_protocol = XWM.getWM().getNETProtocol();
             if (net_protocol != null) {
-                net_protocol.setActiveWindow(this);
+                net_protocol.setActiveWindow(getWindow());
             }
             xSetVisible(true);
         }
     }