diff --git a/tools/js2c.py b/tools/js2c.py
index e01e385afcf..e9a52047739 100755
--- a/tools/js2c.py
+++ b/tools/js2c.py
@@ -37,6 +37,11 @@ import sys
 import string
 import hashlib
 
+try:
+    xrange          # Python 2
+except NameError:
+    xrange = range  # Python 3
+
 
 def ToCArray(elements, step=10):
   slices = (elements[i:i+step] for i in xrange(0, len(elements), step))