diff --git a/src/protein.py b/src/protein.py
index 00963bc..58c6623 100755
--- a/src/protein.py
+++ b/src/protein.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # encoding: utf-8
-# Copyright (c) 2009 Ch. Fufezan.
+# Copyright (c) 2009, 2014 Ch. Fufezan., T. Bald
 # module is distributed under the terms of the GNU General Public License
 
 '''
@@ -39,6 +39,12 @@
 import p3d.atom
 import p3d.parser
 
+# fix for renamed xrange in python3
+try:
+    xrange
+except NameError:
+    xrange = range
+
 
 hash_list = ['chain','atype','resid','resname','non-aa-resname',\
              'aa-resname','model','bkb','oxygen','altconf',