diff --git a/runbot_merge/migrations/17.0.1.15/pre-migration.py b/runbot_merge/migrations/17.0.1.15/pre-migration.py
new file mode 100644
index 00000000..9a74a23b
--- /dev/null
+++ b/runbot_merge/migrations/17.0.1.15/pre-migration.py
@@ -0,0 +1,7 @@
+from odoo.upgrade import util
+
+def migrate(cr, _version):
+    util.remove_field(cr, "res.partner", "message_main_attachment_id")
+    util.remove_field(cr, "runbot_merge.batch", "message_main_attachment_id")
+    util.remove_field(cr, "runbot_merge.pull_requests", "message_main_attachment_id")
+    util.remove_field(cr, "runbot_merge.pull_requests.feedback.template", "message_main_attachment_id")