diff --git a/runbot_merge/models/pull_requests.py b/runbot_merge/models/pull_requests.py
index 107c3194..59b7aa64 100644
--- a/runbot_merge/models/pull_requests.py
+++ b/runbot_merge/models/pull_requests.py
@@ -271,7 +271,7 @@ class Repository(models.Model):
     def _auto_init(self):
         res = super(Repository, self)._auto_init()
         tools.create_unique_index(
-            self._cr, 'runbot_merge_unique_repo', self._table, ['name', 'project_id'])
+            self._cr, 'runbot_merge_unique_repo', self._table, ['name'])
         return res
 
 class Branch(models.Model):