diff --git a/addons/mail/static/src/web/chatter.xml b/addons/mail/static/src/web/chatter.xml
index 9b03bd63e8d..ee969f0c28b 100644
--- a/addons/mail/static/src/web/chatter.xml
+++ b/addons/mail/static/src/web/chatter.xml
@@ -145,7 +145,7 @@
 </t>
 
 <t t-name="mail.Chatter.attachFiles" owl="1">
-    <button class="btn btn-link text-action px-1" aria-label="Attach files" t-att-class="{ 'my-2': !props.compactHeight }" t-on-click="onClickAddAttachments">
+    <button class="btn btn-link text-action px-1 d-flex" aria-label="Attach files" t-att-class="{ 'my-2': !props.compactHeight }" t-on-click="onClickAddAttachments">
         <i class="fa fa-paperclip fa-lg me-1"/>
         <span t-if="attachments.length > 0" t-esc="attachments.length"/>
         <i t-if="!state.thread.areAttachmentsLoaded and state.thread.isLoadingAttachments" class="fa fa-circle-o-notch fa-spin" aria-label="Attachment counter loading..."/>