diff --git a/django/db/backends/utils.py b/django/db/backends/utils.py
index c22cd9e587..8bed6415c3 100644
--- a/django/db/backends/utils.py
+++ b/django/db/backends/utils.py
@@ -1,6 +1,5 @@
 from __future__ import unicode_literals
 
-from collections import defaultdict
 import datetime
 import decimal
 import hashlib