diff --git a/addons/mail/static/src/xml/chat_window.xml b/addons/mail/static/src/xml/chat_window.xml
index 525898dabd8..f21fe09991b 100644
--- a/addons/mail/static/src/xml/chat_window.xml
+++ b/addons/mail/static/src/xml/chat_window.xml
@@ -2,7 +2,7 @@
 <templates xml:space="preserve">
 
     <t t-name="mail.ChatWindow">
-        <div class="o_chat_window">
+        <div class="o_chat_window o_in_appswitcher">
             <div class="o_chat_header">
                 <t t-call="mail.ChatWindowHeaderContent">
                     <t t-set="status" t-value="widget.status"/>
@@ -19,7 +19,7 @@
     </t>
 
     <t t-name="mail.ChatWindowsDropdown">
-        <div t-attf-class="o_chat_window o_chat_window_dropdown dropup #{open ? 'open' : ''}">
+        <div t-attf-class="o_chat_window o_in_appswitcher o_chat_window_dropdown dropup #{open ? 'open' : ''}">
             <span class="o_chat_window_dropdown_toggler dropdown-toggle" data-toggle="dropdown">
                 <i class="fa fa-comments-o"/> <t t-esc="sessions.length"/>
                 <span class="o_total_unread_counter">