diff --git a/addons/crm/crm_lead.py b/addons/crm/crm_lead.py
index 5755174b7b7..d5f90d8a653 100644
--- a/addons/crm/crm_lead.py
+++ b/addons/crm/crm_lead.py
@@ -498,7 +498,7 @@ class crm_lead(base_stage, format_address, osv.osv):
             return res and res.id or False
 
         def _concat_all(attr):
-            return ','.join(filter(lambda x: x, [getattr(opp, attr) or '' for opp in opportunities if hasattr(opp, attr)]))
+            return '\n\n'.join(filter(lambda x: x, [getattr(opp, attr) or '' for opp in opportunities if hasattr(opp, attr)]))
 
         # Process the fields' values
         data = {}
diff --git a/addons/crm/test/process/merge_opportunity.yml b/addons/crm/test/process/merge_opportunity.yml
index 2f0b8e82956..c50af5214e6 100644
--- a/addons/crm/test/process/merge_opportunity.yml
+++ b/addons/crm/test/process/merge_opportunity.yml
@@ -41,7 +41,7 @@
     assert merge_id, 'Fail to create merge opportunity wizard'
     merge_result = self.browse(cr, uid, merge_id)[0]
     assert merge_result.partner_id.id == ref("base.res_partner_1"), 'Partner mismatch: when merging leads/opps with different m2o values, the first not null value prevails (the other are dropped)'
-    assert merge_result.description == 'This is the description of the test lead 1., This is the description of the test lead 2., This is the description of the test opp 1.', 'Description mismatch: when merging leads/opps with different text values, these values should get concatenated and separeted with ", "'
+    assert merge_result.description == 'This is the description of the test lead 1.\n\nThis is the description of the test lead 2.\n\nThis is the description of the test opp 1.', 'Description mismatch: when merging leads/opps with different text values, these values should get concatenated and separated with line returns'
     assert merge_result.type == 'opportunity', 'Type mismatch: when at least one opp in involved in the merge, the result should be a new opp (instead of %s)' % merge_result.type
 -
   The other (tailing) leads/opps shouldn't exist anymore.