diff --git a/addons/project/views/project_portal_templates.xml b/addons/project/views/project_portal_templates.xml
index 14498944913..1bb202f8fd8 100644
--- a/addons/project/views/project_portal_templates.xml
+++ b/addons/project/views/project_portal_templates.xml
@@ -238,7 +238,7 @@
                             <div class="row">
                                 <div t-attf-class="col {{'col-lg-6' if not task.description else 'col-lg-12'}}">
                                     <ul class="list-group">
-                                        <a class="list-group-item list-group-item-action d-flex align-items-center oe_attachments py-1 px-2" t-foreach='task.attachment_ids' t-as='attachment' t-attf-href="/web/content/#{attachment.id}" target="_blank" data-no-post-process="">
+                                        <a class="list-group-item list-group-item-action d-flex align-items-center oe_attachments py-1 px-2" t-foreach='task.attachment_ids' t-as='attachment' t-attf-href="/web/content/#{attachment.id}?download=true" target="_blank" data-no-post-process="">
                                             <div class='oe_attachment_embedded o_image o_image_small mr-2 mr-lg-3' t-att-title="attachment.name" t-att-data-mimetype="attachment.mimetype" t-attf-data-src="/web/image/#{attachment.id}/50x40"/>
                                             <div class='oe_attachment_name text-truncate'><t t-esc='attachment.name'/></div>
                                         </a>