diff --git a/addons/crm/crm_phonecall.py b/addons/crm/crm_phonecall.py
index 50db660e1f0..b9a2d198144 100644
--- a/addons/crm/crm_phonecall.py
+++ b/addons/crm/crm_phonecall.py
@@ -81,6 +81,11 @@ class crm_phonecall(osv.osv):
         'date_closed': fields.datetime('Closed', readonly=True),
         'opportunity_id':fields.many2one ('crm.opportunity', 'Opportunity'),        
     }
+    def onchange_categ_id(self, cr, uid, ids, categ, context={}):
+        if not categ:
+            return {'value':{}}
+        cat = self.pool.get('crm.phonecall.categ').browse(cr, uid, categ, context).probability
+        return {'value':{'probability':cat}}
 
 crm_phonecall()