diff --git a/loopy/kernel/__init__.py b/loopy/kernel/__init__.py
index 121a516c165bc27990887748ba8243243427b0db..0884a3fca3b5ed324f61ef95f74e3b95ca021335 100644
--- a/loopy/kernel/__init__.py
+++ b/loopy/kernel/__init__.py
@@ -25,7 +25,7 @@ THE SOFTWARE.
 """
 
 import six
-from six.moves import range, zip
+from six.moves import range, zip, intern
 
 import numpy as np
 from pytools import RecordWithoutPickling, Record, memoize_method