diff --git a/qui/controls/taskbar/Task.js b/qui/controls/taskbar/Task.js
index 0924a4111db6cbdd0c49cb7f939d1c3081a77abd..50b11a6a674c89b65bc1d21238cb988bfb069f6d 100644
--- a/qui/controls/taskbar/Task.js
+++ b/qui/controls/taskbar/Task.js
@@ -182,7 +182,7 @@ define('qui/controls/taskbar/Task', [
                     },
 
                     mousedown: function (event) {
-                        if (event.event.button) {
+                        if (event.event.button === 0) {
                             self.click(event);
                         }
                     }