diff --git a/doc/howtos/backend/exercise-gantt b/doc/howtos/backend/exercise-gantt
index 6ee1e426ff3..0c24d57f9e5 100644
--- a/doc/howtos/backend/exercise-gantt
+++ b/doc/howtos/backend/exercise-gantt
@@ -42,7 +42,7 @@ diff --git a/openacademy/views/openacademy.xml b/openacademy/views/openacademy.x
 +            <field name="name">session.gantt</field>
 +            <field name="model">openacademy.session</field>
 +            <field name="arch" type="xml">
-+                <gantt string="Session Gantt" color="course_id"
++                <gantt string="Session Gantt"
 +                       date_start="start_date" date_delay="hours"
 +                       default_group_by='instructor_id'>
 +                    <!-- <field name="name"/> this is not required after Odoo 10.0 -->