diff --git a/dynamicweb/settings/base.py b/dynamicweb/settings/base.py
index 1ee2e546..58de437f 100644
--- a/dynamicweb/settings/base.py
+++ b/dynamicweb/settings/base.py
@@ -123,6 +123,7 @@ INSTALLED_APPS = (
     'cms',  # django CMS itself
     'aldryn_apphooks_config',
     'aldryn_boilerplates',
+    'sortedm2m',
     'aldryn_categories',
     'aldryn_common',
     'aldryn_newsblog',