diff --git a/graphene_django/tests/test_query.py b/graphene_django/tests/test_query.py
index 477d147..e6ed49e 100644
--- a/graphene_django/tests/test_query.py
+++ b/graphene_django/tests/test_query.py
@@ -1088,7 +1088,7 @@ REPORTERS = [
     dict(
         first_name="First {}".format(i),
         last_name="Last {}".format(i),
-        email="johndoe+{i}@example.com".format(i),
+        email="johndoe+{}@example.com".format(i),
         a_choice=1,
     )
     for i in range(6)