diff --git a/ptemcee/ensemble.py b/ptemcee/ensemble.py
index 1e52313..2f348a6 100644
--- a/ptemcee/ensemble.py
+++ b/ptemcee/ensemble.py
@@ -1,3 +1,5 @@
+from __future__ import division
+
 import attr
 import numpy as np
 import itertools