diff --git a/wagtail/search/tests/test_queries.py b/wagtail/search/tests/test_queries.py
index 4b7e81b5bb..73f8cf2a7a 100644
--- a/wagtail/search/tests/test_queries.py
+++ b/wagtail/search/tests/test_queries.py
@@ -181,7 +181,7 @@ class TestParseQueryString(SimpleTestCase):
 
     def test_long_filter_value(self):
         filters, _ = parse_query_string(f'foo:ba{"r" * 60_000}')
-        self.assertEqual(filters.dict(), {"foo": f"ba{"r" * 60_000}"})
+        self.assertEqual(filters.dict(), {"foo": f'ba{"r" * 60_000}'})
 
     def test_joined_filters(self):
         filters, query = parse_query_string("foo:bar:baz")