diff --git a/addons/crm/crm_lead.py b/addons/crm/crm_lead.py
index e80cf5ee285..3707e318b10 100644
--- a/addons/crm/crm_lead.py
+++ b/addons/crm/crm_lead.py
@@ -704,7 +704,10 @@ class crm_lead(format_address, osv.osv):
             'date_conversion': fields.datetime.now(),
         }
         if not lead.stage_id or lead.stage_id.type=='lead':
-            val['stage_id'] = self.stage_find(cr, uid, [lead], team_id, [('type', 'in', ('opportunity', 'both'))], context=context)
+            stage_id = self.stage_find(cr, uid, [lead], team_id, [('type', 'in', ['opportunity', 'both'])], context=context)
+            val['stage_id'] = stage_id
+            if stage_id:
+                val['probability'] = self.pool['crm.stage'].browse(cr, uid, stage_id, context=context).probability
         return val
 
     def convert_opportunity(self, cr, uid, ids, partner_id, user_ids=False, team_id=False, context=None):