diff --git a/graphene/relay/tests/test_connection_query.py b/graphene/relay/tests/test_connection_query.py
index aca60a91..b2c10c31 100644
--- a/graphene/relay/tests/test_connection_query.py
+++ b/graphene/relay/tests/test_connection_query.py
@@ -19,7 +19,7 @@ class Query(ObjectType):
     letters = ConnectionField(Letter)
 
     def resolve_letters(self, args, context, info):
-        return letters.values()
+        return list(letters.values())
 
     node = Node.Field()