diff --git a/test/test_api_misc.py b/test/test_api_misc.py
index 66a86c7827e7545297647e8734269c74f245545d_dGVzdC90ZXN0X2FwaV9taXNjLnB5..10039a1c2e76dc9b89eab9b28ac7dbbc1f2e1c51_dGVzdC90ZXN0X2FwaV9taXNjLnB5 100644
--- a/test/test_api_misc.py
+++ b/test/test_api_misc.py
@@ -399,7 +399,7 @@
             error = res.json_body["errors"][0]
             self.assertEqual(error["status"], 422)
             self.assertIn(
-                "at least one relation in_group is required on CWUser", error["details"]
+                "at least one relation in_group is ""required on CWUser", error["details"]
             )
             self.assertEqual(error["source"], {"pointer": "in_group"})
 
diff --git a/tox.ini b/tox.ini
index 66a86c7827e7545297647e8734269c74f245545d_dG94LmluaQ==..10039a1c2e76dc9b89eab9b28ac7dbbc1f2e1c51_dG94LmluaQ== 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,7 +37,7 @@
 
 [flake8]
 exclude = cubicweb_jsonschema/migration/*,test/data/*,.tox/*
-max-line-length = 80
+max-line-length = 100
 
 [pytest]
 addopts = --doctest-modules