diff --git a/deluge/ui/gtk3/common.py b/deluge/ui/gtk3/common.py
index 24530dcab..ddb52720c 100644
--- a/deluge/ui/gtk3/common.py
+++ b/deluge/ui/gtk3/common.py
@@ -34,6 +34,17 @@ from deluge.common import PY2, get_pixmap, osx_check, windows_check
 log = logging.getLogger(__name__)
 
 
+def cmp(x, y):
+    """Replacement for built-in function cmp that was removed in Python 3.
+
+    Compare the two objects x and y and return an integer according to
+    the outcome. The return value is negative if x < y, zero if x == y
+    and strictly positive if x > y.
+    """
+
+    return (x > y) - (x < y)
+
+
 def create_blank_pixbuf(size=16):
     pix = Pixbuf.new(Colorspace.RGB, True, 8, size, size)
     pix.fill(0x0)
diff --git a/deluge/ui/gtk3/listview.py b/deluge/ui/gtk3/listview.py
index 78570f12d..ef328a8c2 100644
--- a/deluge/ui/gtk3/listview.py
+++ b/deluge/ui/gtk3/listview.py
@@ -15,7 +15,7 @@ from gi.repository import GObject, Gtk
 
 from deluge.common import PY2, decode_bytes
 
-from .common import load_pickled_state_file, save_pickled_state_file
+from .common import cmp, load_pickled_state_file, save_pickled_state_file
 
 log = logging.getLogger(__name__)
 
diff --git a/deluge/ui/gtk3/torrentview.py b/deluge/ui/gtk3/torrentview.py
index fad9526ba..0529ebed2 100644
--- a/deluge/ui/gtk3/torrentview.py
+++ b/deluge/ui/gtk3/torrentview.py
@@ -23,6 +23,7 @@ import deluge.component as component
 from deluge.ui.client import client
 
 from . import torrentview_data_funcs as funcs
+from .common import cmp
 from .listview import ListView
 from .removetorrentdialog import RemoveTorrentDialog