diff --git a/odoo/addons/base/rng/gantt_view.rng b/odoo/addons/base/rng/gantt_view.rng
index 08e86b5bc87..00491427d6a 100644
--- a/odoo/addons/base/rng/gantt_view.rng
+++ b/odoo/addons/base/rng/gantt_view.rng
@@ -19,6 +19,7 @@
             <rng:optional><rng:attribute name="string"/></rng:optional>
             <rng:optional><rng:attribute name="create"/></rng:optional>
             <rng:optional><rng:attribute name="edit"/></rng:optional>
+            <rng:optional><rng:attribute name="plan"/></rng:optional>
             <rng:optional><rng:attribute name="default_group_by"/></rng:optional>
             <rng:optional><rng:attribute name="display_unavailability"/></rng:optional>
             <rng:optional><rng:attribute name="total_row"/></rng:optional>