diff --git a/swh/graphql/tests/functional/test_origin_node.py b/swh/graphql/tests/functional/test_origin_node.py
index 698de93..1f5a04a 100644
--- a/swh/graphql/tests/functional/test_origin_node.py
+++ b/swh/graphql/tests/functional/test_origin_node.py
@@ -1,56 +1,59 @@
 # Copyright (C) 2022 The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import pytest
 
 from ..data import get_origins
 from .utils import assert_missing_object, get_query_response
 
 
 def test_invalid_get(client):
     query_str = """
     {
       origin(url: "http://example.com/non-existing") {
         url
       }
     }
     """
     assert_missing_object(client, query_str, "origin")
 
 
 @pytest.mark.parametrize("origin", get_origins())
 def test_get(client, storage, origin):
-    query_str = f"""
-    {{
-      origin(url: "{origin.url}") {{
+    query_str = (
+        """
+    {
+      origin(url: "%s") {
         url
         id
-        visits(first: 10) {{
-          nodes {{
+        visits(first: 10) {
+          nodes {
             id
-          }}
-        }}
-        latestVisit {{
+          }
+        }
+        latestVisit {
           visitId
-        }}
-        snapshots(first: 2) {{
-          nodes {{
+        }
+        snapshots(first: 2) {
+          nodes {
             id
-          }}
-        }}
-      }}
-    }}
+          }
+        }
+      }
+    }
     """
+        % origin.url
+    )
 
     response, _ = get_query_response(client, query_str)
     data_origin = response["origin"]
     storage_origin = storage.origin_get([origin.url])[0]
     visits_and_statuses = storage.origin_visit_get_with_statuses(origin.url).results
     assert data_origin["url"] == storage_origin.url
     assert data_origin["id"] == storage_origin.id.hex()
     assert len(data_origin["visits"]["nodes"]) == len(visits_and_statuses)
     assert data_origin["latestVisit"]["visitId"] == visits_and_statuses[-1].visit.visit
     snapshots = storage.origin_snapshot_get_all(origin.url)
     assert len(data_origin["snapshots"]["nodes"]) == len(snapshots)