diff --git a/graphene/utils/tests/test_deduplicator.py b/graphene/utils/tests/test_deduplicator.py
index 604ae438..b845caf1 100644
--- a/graphene/utils/tests/test_deduplicator.py
+++ b/graphene/utils/tests/test_deduplicator.py
@@ -150,8 +150,8 @@ def test_example_end_to_end():
     result = schema.execute(query)
     assert not result.errors
 
-    result.data = deflate(result.data)
-    assert result.data == {
+    data = deflate(result.data)
+    assert data == {
         "events": [
             {
                 "__typename": "Event",