diff --git a/deluge/core/core.py b/deluge/core/core.py
index 30eb6961b..0f5bcaa18 100644
--- a/deluge/core/core.py
+++ b/deluge/core/core.py
@@ -681,6 +681,7 @@ class Core(component.Component):
     def queue_up(self, torrent_ids):
         log.debug("Attempting to queue %s to up", torrent_ids)
         #torrent_ids must be sorted before moving.
+        torrent_ids = list(torrent_ids)
         torrent_ids.sort(key = lambda id: self.torrentmanager.torrents[id].get_queue_position())
         for torrent_id in torrent_ids:
             try:
@@ -694,6 +695,7 @@ class Core(component.Component):
     def queue_down(self, torrent_ids):
         log.debug("Attempting to queue %s to down", torrent_ids)
         #torrent_ids must be sorted before moving.
+        torrent_ids = list(torrent_ids)
         torrent_ids.sort(key = lambda id: -self.torrentmanager.torrents[id].get_queue_position())
         for torrent_id in torrent_ids:
             try: