diff --git a/js/ui/placeDisplay.js b/js/ui/placeDisplay.js
index 230bd74a3..a7a35d18e 100644
--- a/js/ui/placeDisplay.js
+++ b/js/ui/placeDisplay.js
@@ -93,7 +93,7 @@ PlaceDeviceInfo.prototype = {
         if (!this.isRemovable())
             return;
 
-        this._mount.unmount(0, null, Lang.bind(this, this._removeFinish), null);
+        this._mount.unmount(0, null, Lang.bind(this, this._removeFinish));
     },
 
     _removeFinish: function(o, res, data) {
diff --git a/js/ui/runDialog.js b/js/ui/runDialog.js
index 2cd851868..403e6df6f 100644
--- a/js/ui/runDialog.js
+++ b/js/ui/runDialog.js
@@ -63,7 +63,7 @@ CommandCompleter.prototype = {
 
     _onGetEnumerateComplete : function(obj, res) {
         this._enumerator = obj.enumerate_children_finish(res);
-        this._enumerator.next_files_async(100, GLib.PRIORITY_LOW, null, Lang.bind(this, this._onNextFileComplete), null);
+        this._enumerator.next_files_async(100, GLib.PRIORITY_LOW, null, Lang.bind(this, this._onNextFileComplete));
     },
 
     _onNextFileComplete : function(obj, res) {
@@ -72,7 +72,7 @@ CommandCompleter.prototype = {
             this._childs[this._i].push(files[i].get_name());
         }
         if (files.length) {
-            this._enumerator.next_files_async(100, GLib.PRIORITY_LOW, null, Lang.bind(this, this._onNextFileComplete), null);
+            this._enumerator.next_files_async(100, GLib.PRIORITY_LOW, null, Lang.bind(this, this._onNextFileComplete));
         } else {
             this._enumerator.close(null);
             this._enumerator = null;
@@ -99,7 +99,7 @@ CommandCompleter.prototype = {
         }
         let file = Gio.file_new_for_path(this._paths[i]);
         this._childs[this._i] = [];
-        file.enumerate_children_async(Gio.FILE_ATTRIBUTE_STANDARD_NAME, Gio.FileQueryInfoFlags.NONE, GLib.PRIORITY_LOW, null, Lang.bind(this, this._onGetEnumerateComplete), null);
+        file.enumerate_children_async(Gio.FILE_ATTRIBUTE_STANDARD_NAME, Gio.FileQueryInfoFlags.NONE, GLib.PRIORITY_LOW, null, Lang.bind(this, this._onGetEnumerateComplete));
     },
 
     _onChanged : function(m, f, of, type) {