diff --git a/addons/project_timesheet/project_timesheet.py b/addons/project_timesheet/project_timesheet.py
index b785e9d9d7b..536cd0a5b09 100644
--- a/addons/project_timesheet/project_timesheet.py
+++ b/addons/project_timesheet/project_timesheet.py
@@ -80,7 +80,7 @@ class project_work(osv.osv):
         if line_id in list_avail_ids:
             obj = self.pool.get('hr.analytic.timesheet')
             if 'name' in vals:
-                vals_line['name'] = '%s: %s' % (task.name, vals['name'] or '/')
+                vals_line['name'] = '%s: %s' % (tools.ustr(task.name), tools.ustr(vals['name']) or '/')
             if 'user_id' in vals:
                 vals_line['user_id'] = vals['user_id']
             if 'date' in vals: