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-rw-r--r--django/db/migrations/graph.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/django/db/migrations/graph.py b/django/db/migrations/graph.py
index 0e3c5905d6..bf4d6b5252 100644
--- a/django/db/migrations/graph.py
+++ b/django/db/migrations/graph.py
@@ -1,4 +1,5 @@
from __future__ import unicode_literals
+
from collections import deque
from django.db.migrations.state import ProjectState