diff --git a/sat/plugins/plugin_xep_0384.py b/sat/plugins/plugin_xep_0384.py
index fd181a83..e1477900 100644
--- a/sat/plugins/plugin_xep_0384.py
+++ b/sat/plugins/plugin_xep_0384.py
@@ -200,7 +200,7 @@ class OmemoStorage(omemo.Storage):
 
     def storeSession(self, callback, bare_jid, device_id, session):
         key = '\n'.join([KEY_SESSION, bare_jid, str(device_id)])
-        self._call(callback, self._data.force, key, session)
+        self._call(callback, self.data.force, key, session)
 
     def deleteSession(self, callback, bare_jid, device_id):
         key = '\n'.join([KEY_SESSION, bare_jid, str(device_id)])