diff --git a/addons/mail/static/src/core/common/message.xml b/addons/mail/static/src/core/common/message.xml
index bcce162a0a3..f3794e556be 100644
--- a/addons/mail/static/src/core/common/message.xml
+++ b/addons/mail/static/src/core/common/message.xml
@@ -139,7 +139,7 @@
                         </div>
                         <AttachmentList
                             t-if="message.attachments.length > 0"
-                            attachments="message.attachments"
+                            attachments="message.attachments.map((a) => a)"
                             unlinkAttachment.bind="onClickAttachmentUnlink"
                             imagesHeight="300"/>
                         <LinkPreviewList t-if="message.linkPreviews.length > 0 and store.hasLinkPreviewFeature and !message.linkPreviewSquash" linkPreviews="message.linkPreviews" deletable="deletable"/>