diff --git a/addons/mail/static/tests/helpers/model_definitions_setup.js b/addons/mail/static/tests/helpers/model_definitions_setup.js
index 2097d2cbd76378961bb715045b704a528c0ae6e0..f584510c87df8dc718660e995336f8cd7ab450f7 100644
--- a/addons/mail/static/tests/helpers/model_definitions_setup.js
+++ b/addons/mail/static/tests/helpers/model_definitions_setup.js
@@ -22,7 +22,7 @@ addModelNamesToFetch([
 addFakeModel('res.fake', {
     activity_ids: { string: "Activities", type: 'one2many', relation: 'mail.activity' },
     email_cc: { type: 'char' },
-    partner_ids: { relation: 'res.partner', string: "Related partners", type: 'many2one', },
+    partner_ids: { relation: 'res.partner', string: "Related partners", type: 'one2many' },
 });
 
 //--------------------------------------------------------------------------