diff --git a/addons/project/project.py b/addons/project/project.py
index 1760e8d6aa3..804b725e6fa 100644
--- a/addons/project/project.py
+++ b/addons/project/project.py
@@ -1154,7 +1154,7 @@ class task(base_stage, osv.osv):
 
     def message_get_subscribers(self, cr, uid, ids, context=None):
         """ Override to add responsible user and project manager. """
-        user_ids = super(project_task, self).message_get_subscribers(cr, uid, ids, context=context)
+        user_ids = super(task, self).message_get_subscribers(cr, uid, ids, context=context)
         for obj in self.browse(cr, uid, ids, context=context):
             if obj.user_id and not obj.user_id.id in user_ids:
                 user_ids.append(obj.user_id.id)