diff --git a/tests/forms_tests/field_tests/test_emailfield.py b/tests/forms_tests/field_tests/test_emailfield.py
index a0c8d5be1b..ce9dd7083a 100644
--- a/tests/forms_tests/field_tests/test_emailfield.py
+++ b/tests/forms_tests/field_tests/test_emailfield.py
@@ -64,10 +64,10 @@ class EmailFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
             "'Ensure this value has at most 15 characters (it has 20).'",
         ):
             f.clean("alf123456788@foo.com")
-        long_email = 'a' * 245 + '@example.com'
+        long_email = "a" * 245 + "@example.com"
         with self.assertRaisesMessage(
             ValidationError,
-            "'Ensure this value has at most 15 characters (it has 257).'"
+            "'Ensure this value has at most 15 characters (it has 257).'",
         ):
             f.clean(long_email)