diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index 6b289214f..13c147fdd 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -88,7 +88,7 @@ AltTabPopup.prototype = {
         box.append(new Clutter.Rectangle({ width: 1,
                                            color: POPUP_APPICON_SEPARATOR_COLOR }),
                    Big.BoxPackFlags.EXPAND);
-        this._separator = box
+        this._separator = box;
         this._appsBox.add_actor(box);
     },