diff --git a/appIcons.js b/appIcons.js
index 8255632..ab0d22b 100644
--- a/appIcons.js
+++ b/appIcons.js
@@ -376,8 +376,8 @@ var TaskbarAppIcon = GObject.registerClass({
         this.updateIcon();
     }
 
-    onWindowEnteredOrLeft() {
-        if (this._checkIfFocusedApp()) {
+    onWindowEnteredOrLeft(display, number, metaWindow) {
+        if (number > 0 && tracker.get_window_app(metaWindow) == this.app) {
             this._updateWindows();
             this._displayProperIndicator();
         }