diff --git a/js/ui/overview.js b/js/ui/overview.js
index 9d4cad82a..ec6762544 100644
--- a/js/ui/overview.js
+++ b/js/ui/overview.js
@@ -281,7 +281,8 @@ Overview.prototype = {
     },
 
     _onButtonPress: function(actor, event) {
-        if (this._scrollDirection == SwipeScrollDirection.NONE)
+        if (this._scrollDirection == SwipeScrollDirection.NONE
+            || event.get_button() != 1)
             return;
 
         let [stageX, stageY] = event.get_coords();