diff --git a/deluge/ui/gtkui/connectionmanager.py b/deluge/ui/gtkui/connectionmanager.py
index a365ddfa7..107acb3e9 100644
--- a/deluge/ui/gtkui/connectionmanager.py
+++ b/deluge/ui/gtkui/connectionmanager.py
@@ -363,7 +363,7 @@ class ConnectionManager(component.Component):
         if self.gtkui_config["autoconnect"]:
             self.gtkui_config["autoconnect_host_id"] = host_id
 
-    def on_button_connect_clicked(self, widget):
+    def on_button_connect_clicked(self, widget=None):
         model, row = self.hostlist.get_selection().get_selected()
         status = model[row][HOSTLIST_COL_STATUS]
         if status == "Connected":