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 be90205c4a9..f5f02da6990 100644
--- a/addons/mail/static/src/components/attachment_viewer/attachment_viewer.js
+++ b/addons/mail/static/src/components/attachment_viewer/attachment_viewer.js
@@ -117,18 +117,6 @@ export class AttachmentViewer extends Component {
         }
     }
 
-    /**
-     * Display the previous attachment in the list of attachments.
-     *
-     * @private
-     */
-    _previous() {
-        if (!this.attachmentViewer.dialogOwner || !this.attachmentViewer.dialogOwner.attachmentListOwnerAsAttachmentView) {
-            return;
-        }
-        this.attachmentViewer.dialogOwner.attachmentListOwnerAsAttachmentView.selectPreviousAttachment();
-    }
-
     /**
      * Prompt the browser print of this attachment.
      *
@@ -291,7 +279,7 @@ export class AttachmentViewer extends Component {
      */
     _onClickPrevious(ev) {
         ev.stopPropagation();
-        this._previous();
+        this.attachmentViewer.previous();
     }
 
     /**
@@ -359,7 +347,7 @@ export class AttachmentViewer extends Component {
                 this.attachmentViewer.next();
                 break;
             case 'ArrowLeft':
-                this._previous();
+                this.attachmentViewer.previous();
                 break;
             case 'Escape':
                 this.attachmentViewer.close();
diff --git a/addons/mail/static/src/models/attachment_viewer.js b/addons/mail/static/src/models/attachment_viewer.js
index 186c1a8db75..0036e77fd8a 100644
--- a/addons/mail/static/src/models/attachment_viewer.js
+++ b/addons/mail/static/src/models/attachment_viewer.js
@@ -23,7 +23,7 @@ registerModel({
             return Boolean(this.component && this.component.root.el && this.component.root.el.contains(element));
         },
         /**
-         * Display the previous attachment in the list of attachments.
+         * Display the next attachment in the list of attachments.
          */
         next() {
             if (!this.dialogOwner || !this.dialogOwner.attachmentListOwnerAsAttachmentView) {
@@ -103,6 +103,15 @@ registerModel({
             ev.stopPropagation();
             this.update({ isImageLoading: false });
         },
+        /**
+         * Display the previous attachment in the list of attachments.
+         */
+        previous() {
+            if (!this.dialogOwner || !this.dialogOwner.attachmentListOwnerAsAttachmentView) {
+                return;
+            }
+            this.dialogOwner.attachmentListOwnerAsAttachmentView.selectPreviousAttachment();
+        },
         /**
          * @private
          * @returns {string}