diff --git a/src/util.py b/src/util.py
index 8e1d2c0..67e5d5d 100755
--- a/src/util.py
+++ b/src/util.py
@@ -3,7 +3,7 @@
 #import pytz
 import na
 
-class listdict(collections.MutableMapping):
+class listdict(collections.abc.MutableMapping):
 	def __init__(self, thedict=None):
 		self._dict = {}
 		if not thedict is None: