diff --git a/addons/project_timesheet/project_timesheet.py b/addons/project_timesheet/project_timesheet.py
index 54a4a2a3b84..1d7531c7810 100644
--- a/addons/project_timesheet/project_timesheet.py
+++ b/addons/project_timesheet/project_timesheet.py
@@ -68,7 +68,7 @@ class task(osv.osv):
 
     def _get_task(self, cr, uid, id, context=None):
         res = []
-        for line in self.pool.get('account.analytic.line').search_read(cr,uid,[('task_id', '!=', False),('id','in',id)], context=context):
+        for line in self.pool.get('account.analytic.line').search_read(cr,uid,[('task_id', '!=', False),('id','in',id)], ['task_id'], context=context):
             res.append(line['task_id'][0])
         return res