diff --git a/addons/project/company.py b/addons/project/company.py
index ea9458bb468..18f970118a4 100644
--- a/addons/project/company.py
+++ b/addons/project/company.py
@@ -35,7 +35,7 @@ class res_company(osv.osv):
     def write(self, cr, uid, ids,vals, context={}):
         task_ids=self.pool.get('project.task').search(cr, uid, [('state','in',['open', 'pending'])])
         if ('project_time_mode_id' in vals) and task_ids:
-            raise osv.except_osv(_('Error !'), _('You can not modify Project Time Unit as there are open or pending tasks created with current time unit.))
+            raise osv.except_osv(_('Error !'), _('You cannot modify Project Time Unit as there are open or pending tasks created with current time unit.'))
         return super(res_company,self).write(cr, uid, ids, vals, context=context)
 
 res_company()