diff --git a/addons/mail/static/src/components/attachment_viewer/attachment_viewer.js b/addons/mail/static/src/components/attachment_viewer/attachment_viewer.js
index 29653cf5425..730a6a0cae9 100644
--- a/addons/mail/static/src/components/attachment_viewer/attachment_viewer.js
+++ b/addons/mail/static/src/components/attachment_viewer/attachment_viewer.js
@@ -269,17 +269,6 @@ export class AttachmentViewer extends Component {
     // Handlers
     //--------------------------------------------------------------------------
 
-    /**
-     * Called when clicking on download icon.
-     *
-     * @private
-     * @param {MouseEvent} ev
-     */
-    _onClickDownload(ev) {
-        ev.stopPropagation();
-        this.attachmentViewer.attachment.download();
-    }
-
     /**
      * @private
      * @param {MouseEvent} ev
diff --git a/addons/mail/static/src/components/attachment_viewer/attachment_viewer.xml b/addons/mail/static/src/components/attachment_viewer/attachment_viewer.xml
index 8d74ef96e6c..2847ecdae30 100644
--- a/addons/mail/static/src/components/attachment_viewer/attachment_viewer.xml
+++ b/addons/mail/static/src/components/attachment_viewer/attachment_viewer.xml
@@ -25,7 +25,7 @@
                         <span class="o_AttachmentViewer_nameText text-truncate" t-esc="attachmentViewer.attachment.displayName"/>
                     </div>
                     <div class="o-autogrow"/>
-                    <div class="o_AttachmentViewer_buttonDownload o_AttachmentViewer_headerItem o_AttachmentViewer_headerItemButton d-flex align-items-center px-3 o_cursor_pointer" t-on-click="_onClickDownload" role="button" title="Download">
+                    <div class="o_AttachmentViewer_buttonDownload o_AttachmentViewer_headerItem o_AttachmentViewer_headerItemButton d-flex align-items-center px-3 o_cursor_pointer" t-on-click="attachmentViewer.onClickDownload" role="button" title="Download">
                         <i class="o_AttachmentViewer_headerItemButtonIcon fa fa-download fa-fw" t-att-class="{ 'o-hasLabel me-2': messaging.device.sizeClass > env.device.SIZES.MD }" role="img"/>
                         <t t-if="messaging.device.sizeClass > env.device.SIZES.MD">
                             <span>Download</span>
@@ -78,7 +78,7 @@
                         <div class="o_AttachmentViewer_toolbarButton btn btn-dark p-3 rounded-0" t-on-click="_onClickPrint" title="Print" role="button">
                             <i class="fa fa-fw fa-print" role="img"/>
                         </div>
-                        <div class="o_AttachmentViewer_buttonDownload o_AttachmentViewer_toolbarButton btn btn-dark p-3 rounded-0 o_cursor_pointer" t-on-click="_onClickDownload" title="Download" role="button">
+                        <div class="o_AttachmentViewer_buttonDownload o_AttachmentViewer_toolbarButton btn btn-dark p-3 rounded-0 o_cursor_pointer" t-on-click="attachmentViewer.onClickDownload" title="Download" role="button">
                             <i class="fa fa-download fa-fw" role="img"/>
                         </div>
                     </div>
diff --git a/addons/mail/static/src/models/attachment_viewer.js b/addons/mail/static/src/models/attachment_viewer.js
index 13bbb5f5340..aa9ab1e8357 100644
--- a/addons/mail/static/src/models/attachment_viewer.js
+++ b/addons/mail/static/src/models/attachment_viewer.js
@@ -43,6 +43,15 @@ registerModel({
         onClickClose(ev) {
             this.close();
         },
+        /**
+         * Called when clicking on download icon.
+         *
+         * @param {MouseEvent} ev
+         */
+        onClickDownload(ev) {
+            ev.stopPropagation();
+            this.attachment.download();
+        },
         /**
          * @private
          * @returns {string}