diff --git a/modoboa/limits/api/v1/tests.py b/modoboa/limits/api/v1/tests.py
index 49b53eafd..48b6315bc 100644
--- a/modoboa/limits/api/v1/tests.py
+++ b/modoboa/limits/api/v1/tests.py
@@ -93,7 +93,7 @@ class APIAdminLimitsTestCase(lib_tests.ModoAPITestCase):
         data["name"] = "test5.com"
         response = self.client.post(url, data, format="json")
         self.assertEqual(response.status_code, 403)
-        self.assertEqual(response.json()["error"], '"Domains: limit reached"')
+        self.assertEqual(response.json()["error"], "Domains: limit reached")
 
         resp = self.client.delete(
             reverse("v1:domain-detail", args=[Domain.objects.get(name="test4.com").pk])