diff --git a/js/ui/workspace.js b/js/ui/workspace.js
index 06f2041c0..2bab2f87b 100644
--- a/js/ui/workspace.js
+++ b/js/ui/workspace.js
@@ -566,7 +566,6 @@ var WindowOverlay = new Lang.Class({
     _animateOverlayActor(actor, x, y, width, height) {
         let params = { x: x,
                        y: y,
-                       width: width,
                        time: Overview.ANIMATION_TIME,
                        transition: 'easeOutQuad' };