diff --git a/js/ui/windowManager.js b/js/ui/windowManager.js
index c809c0a22..c535fef4d 100644
--- a/js/ui/windowManager.js
+++ b/js/ui/windowManager.js
@@ -299,12 +299,28 @@ const WindowManager = new Lang.Class({
         }));
         if (actor.meta_window.is_attached_dialog()) {
             this._checkDimming(actor.get_meta_window().get_transient_for());
+            if (this._shouldAnimate()) {
+                actor.set_scale(1.0, 0.0);
+                actor.show();
+                this._mapping.push(actor);
 
-            if (!this._shouldAnimate()) {
-                shellwm.completed_map(actor);
+                Tweener.addTween(actor,
+                                 { scale_y: 1,
+                                   time: WINDOW_ANIMATION_TIME,
+                                   transition: "easeOutQuad",
+                                   onComplete: this._mapWindowDone,
+                                   onCompleteScope: this,
+                                   onCompleteParams: [shellwm, actor],
+                                   onOverwrite: this._mapWindowOverwrite,
+                                   onOverwriteScope: this,
+                                   onOverwriteParams: [shellwm, actor]
+                                 });
                 return;
             }
-        } else if (!this._shouldAnimateActor(actor)) {
+            shellwm.completed_map(actor);
+            return;
+        }
+        if (!this._shouldAnimateActor(actor)) {
             shellwm.completed_map(actor);
             return;
         }
@@ -360,7 +376,7 @@ const WindowManager = new Lang.Class({
                 return;
             }
 
-            actor.opacity = 255;
+            actor.set_scale(1.0, 1.0);
             actor.show();
             this._destroying.push(actor);
 
@@ -370,7 +386,7 @@ const WindowManager = new Lang.Class({
             }));
 
             Tweener.addTween(actor,
-                             { opacity: 0,
+                             { scale_y: 0,
                                time: WINDOW_ANIMATION_TIME,
                                transition: "easeOutQuad",
                                onComplete: this._destroyWindowDone,