diff --git a/requirements.txt b/requirements.txt
index 87ce38c..467e738 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ scipy
 sklearn
 theano
 lasagne
+future
diff --git a/src/SIF_embedding.py b/src/SIF_embedding.py
index 4e523b5..e6ebdda 100644
--- a/src/SIF_embedding.py
+++ b/src/SIF_embedding.py
@@ -1,6 +1,8 @@
 import numpy as np
 from sklearn.decomposition import TruncatedSVD
 
+# Python3 compatibility
+from past.builtins import xrange
 
 def get_weighted_average(We, x, w):
     """