diff --git a/setup.py b/setup.py
index f8a5e05..84d7661 100644
--- a/setup.py
+++ b/setup.py
@@ -47,6 +47,7 @@ setup(name='collective.dms.thesaurus',
           #'plone.directives.form',
           #'collective.contact.core',
           'five.grok',
+          'plone.api',
       ],
       extras_require={
           'test': ['plone.app.testing',