diff --git a/lib/pythonutil.py b/lib/pythonutil.py
index bf5e1a4..cba8654 100644
--- a/lib/pythonutil.py
+++ b/lib/pythonutil.py
@@ -4,7 +4,7 @@
 
 def calcDottedNetmask(mask):
     bits = 0
-    for i in xrange(32 - mask, 32):
+    for i in range(32 - mask, 32):
         bits |= 1 << i
     packed_value = pack("!I", bits)
     addr = inet_ntoa(packed_value)