diff --git a/addons/crm/crm_lead.py b/addons/crm/crm_lead.py
index 294adc863b5..6abce8921cf 100644
--- a/addons/crm/crm_lead.py
+++ b/addons/crm/crm_lead.py
@@ -587,27 +587,25 @@ class crm_lead(base_stage, format_address, osv.osv):
         return True
 
     def _merge_opportunity_attachments(self, cr, uid, opportunity_id, opportunities, context=None):
-        attachment = self.pool.get('ir.attachment')
+        attach_obj = self.pool.get('ir.attachment')
 
         # return attachments of opportunity
         def _get_attachments(opportunity_id):
-            attachment_ids = attachment.search(cr, uid, [('res_model', '=', self._name), ('res_id', '=', opportunity_id)], context=context)
-            return attachment.browse(cr, uid, attachment_ids, context=context)
+            attachment_ids = attach_obj.search(cr, uid, [('res_model', '=', self._name), ('res_id', '=', opportunity_id)], context=context)
+            return attach_obj.browse(cr, uid, attachment_ids, context=context)
 
-        count = 1
         first_attachments = _get_attachments(opportunity_id)
+        #counter of all attachments to move. Used to make sure the name is different for all attachments
+        count = 1
         for opportunity in opportunities:
             attachments = _get_attachments(opportunity.id)
-            for first in first_attachments:
-                for attachment in attachments:
-                    if attachment.name == first.name:
-                        values = dict(
-                            name = "%s (%s)" % (attachment.name, count,),
-                            res_id = opportunity_id,
-                        )
-                        attachment.write(values)
-                        count+=1
-
+            for attachment in attachments:
+                values = {'res_id': opportunity_id,}
+                for attachment_in_first in first_attachments:
+                    if attachment.name == attachment_in_first.name:
+                        name = "%s (%s)" % (attachment.name, count,),
+                count+=1
+                attachment.write(values)
         return True
 
     def merge_opportunity(self, cr, uid, ids, context=None):