diff --git a/project/settings.py b/project/settings.py
index 8e3c8a81..41d842cc 100644
--- a/project/settings.py
+++ b/project/settings.py
@@ -40,6 +40,7 @@ INSTALLED_APPS = [
     'anymail',
     'active_link',
     'django_filters',
+    'mptt',
 ] + [
     'apps.auth.apps',
     'apps.user',