diff --git a/addons/mail/static/src/js/basic_view.js b/addons/mail/static/src/js/basic_view.js
index c8af4a75dd0..b6cdfa25370 100644
--- a/addons/mail/static/src/js/basic_view.js
+++ b/addons/mail/static/src/js/basic_view.js
@@ -17,7 +17,7 @@ BasicView.include({
             hasRecordReloadOnAttachmentsChanged: post_refresh === 'always',
             hasRecordReloadOnMessagePosted: !!post_refresh,
             hasRecordReloadOnFollowersUpdate: !!followers_post_refresh,
-            isActivityBoxVisible: this._getFieldOption('message_ids', 'open_attachments', false)
+            isAttachmentBoxVisible: this._getFieldOption('message_ids', 'open_attachments', false)
                                     || this._getFieldOption('message_follower_ids', 'open_attachments', false),
         };
         const fieldsInfo = this.fieldsInfo[this.viewType];
diff --git a/addons/mail/static/src/widgets/form_renderer/form_renderer.js b/addons/mail/static/src/widgets/form_renderer/form_renderer.js
index 8e4ca059580..266d8c60f38 100644
--- a/addons/mail/static/src/widgets/form_renderer/form_renderer.js
+++ b/addons/mail/static/src/widgets/form_renderer/form_renderer.js
@@ -103,7 +103,7 @@ FormRenderer.include({
             hasActivities: this.chatterFields.hasActivityIds,
             hasFollowers: this.chatterFields.hasMessageFollowerIds,
             hasThread: this.chatterFields.hasMessageIds,
-            isAttachmentBoxVisible: this.chatterFields.isActivityBoxVisible,
+            isAttachmentBoxVisible: this.chatterFields.isAttachmentBoxVisible,
             messageIds,
             threadAttachmentCount,
             threadId: this.state.res_id,