diff --git a/src/core.py b/src/core.py
index 1c3cf1c01..a21655855 100644
--- a/src/core.py
+++ b/src/core.py
@@ -654,8 +654,8 @@ class Manager:
                                                 "tracker_status",
                                                 _("Announce sent"))
             elif event['event_type'] is self.constants['EVENT_LISTEN_FAILED']:
-                deluge_core.set_listen_on(self.get_state()['port'], 
-                                            self.get_state()['port'])
+                deluge_core.set_listen_on([self.get_state()['port'], 
+                                            self.get_state()['port']])
             elif event['event_type'] is self.constants['EVENT_TRACKER_REPLY']:
                 self.set_supp_torrent_state_val(event['unique_ID'], 
                                                 "tracker_status",