diff --git a/addons/project/views/project_views.xml b/addons/project/views/project_views.xml
index 21bd539a854..b63b5a7e7f6 100644
--- a/addons/project/views/project_views.xml
+++ b/addons/project/views/project_views.xml
@@ -1064,7 +1064,7 @@
                         </button>
                         <!-- Dummy tag used to organize buttons -->
                         <span id="end_rating_buttons" invisible="1"/>
-                        <button name="action_open_parent_task" type="object" class="oe_stat_button" icon="fa-tasks" string="Parent Task" attrs="{'invisible': [('parent_id', '=', False)]}"/>
+                        <button name="action_open_parent_task" type="object" class="oe_stat_button" icon="fa-tasks" string="Parent Task" attrs="{'invisible': ['|', ('allow_subtasks', '=', False), ('parent_id', '=', False)]}" groups="project.group_subtask_project"/>
                         <button name="action_recurring_tasks" type="object" attrs="{'invisible': [('recurrence_id', '=', False)]}" class="oe_stat_button" icon="fa-repeat" groups="project.group_project_recurring_tasks">
                             <div class="o_field_widget o_stat_info">
                                 <span class="o_stat_value">