diff --git a/python/lammps/data.py b/python/lammps/data.py
index 892d628356..426da47ab2 100644
--- a/python/lammps/data.py
+++ b/python/lammps/data.py
@@ -16,7 +16,7 @@
 # Written by Richard Berger <richard.berger@temple.edu>
 ################################################################################
 
-class NeighList:
+class NeighList(object):
     """This is a wrapper class that exposes the contents of a neighbor list.
 
     It can be used like a regular Python list. Each element is a tuple of: