diff --git a/addons/mail/static/src/components/chatter_container/chatter_container.xml b/addons/mail/static/src/components/chatter_container/chatter_container.xml
index ac333a37ff0..671a5137b63 100644
--- a/addons/mail/static/src/components/chatter_container/chatter_container.xml
+++ b/addons/mail/static/src/components/chatter_container/chatter_container.xml
@@ -2,7 +2,7 @@
 <templates xml:space="preserve">
 
     <t t-name="mail.ChatterContainer" owl="1">
-        <div class="o_ChatterContainer flex-grow-1 d-flex" t-att-class="{ 'o-isInFormSheetBg mx-auto': props.isInFormSheetBg }" t-attf-class="{{ props.className }}" data-command-category="mail" t-ref="root">
+        <div class="o_ChatterContainer flex-grow-1 d-flex overflow-auto" t-att-class="{ 'o-isInFormSheetBg mx-auto': props.isInFormSheetBg }" t-attf-class="{{ props.className }}" data-command-category="mail" t-ref="root">
             <t t-if="isLoaded and chatter and chatter.thread">
                 <Chatter record="chatter"/>
             </t>