diff --git a/wicd/wnettools.py b/wicd/wnettools.py
index bfa290b..cb9d125 100644
--- a/wicd/wnettools.py
+++ b/wicd/wnettools.py
@@ -38,6 +38,7 @@ class BaseWirelessInterface() -- Control a wireless network interface.
 import dbus
 import socket, fcntl
 import shutil
+from functools import cmp_to_key
 
 from . import wpath
 from . import misc
@@ -1444,7 +1445,7 @@ def _ParseAccessPoint(self, cell, ralink_info):
         m = re.findall(bitrates_pattern, bitrates)
         if m:
             # numeric sort
-            ap['bitrates'] = sorted(m, lambda x, y: int(float(x) - float(y)))
+            ap['bitrates'] = sorted(m, key=cmp_to_key(lambda x, y: int(float(x) - float(y))))
         else:
             ap['bitrates'] = None