diff --git a/models/__init__.py b/models/__init__.py
index a644c869d6f46fa97d2e2de78c01fc4b29b4f2b1..b1ff0d15320ace44259623d83edb927ab20a8ada 100644
--- a/models/__init__.py
+++ b/models/__init__.py
@@ -2,4 +2,5 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 from . import account_move
+from . import membership_line
 from . import res_partner
diff --git a/models/membership_line.py b/models/membership_line.py
new file mode 100644
index 0000000000000000000000000000000000000000..bc362acad7b6f65afc009d2fb65c6fac7e81ef73
--- /dev/null
+++ b/models/membership_line.py
@@ -0,0 +1,10 @@
+# Copyright 2021 Le Filament (<http://www.le-filament.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import fields, models
+
+
+class MembershipLine(models.Model):
+    _inherit = "membership.membership_line"
+
+    category_id = fields.Many2one(store=True)