diff --git a/mayan/apps/rest_api/filters.py b/mayan/apps/rest_api/filters.py
index e0db06cfef..144717c3ca 100644
--- a/mayan/apps/rest_api/filters.py
+++ b/mayan/apps/rest_api/filters.py
@@ -1,5 +1,7 @@
 from __future__ import absolute_import
 
+from django.core.exceptions import PermissionDenied
+
 from rest_framework.filters import BaseFilterBackend
 
 from acls.models import AccessEntry
diff --git a/mayan/apps/rest_api/permissions.py b/mayan/apps/rest_api/permissions.py
index 227d1b3983..4d142b3cac 100644
--- a/mayan/apps/rest_api/permissions.py
+++ b/mayan/apps/rest_api/permissions.py
@@ -1,5 +1,7 @@
 from __future__ import absolute_import
 
+from django.core.exceptions import PermissionDenied
+
 from rest_framework.permissions import BasePermission
 
 from acls.models import AccessEntry