diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index 657ad2d6ebbd8..ea55a1e8002aa 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -1055,7 +1055,7 @@
 </t>
 
 <div t-name="web.DropdownMenu" t-att-class="widget.dropdownStyle.el.class" t-att="widget.dropdownStyle.el.attrs">
-    <button t-att-class="widget.dropdownStyle.mainButton.class" data-toggle="dropdown" aria-expanded="false" tabindex="-1">
+    <button t-att-class="widget.dropdownStyle.mainButton.class" data-toggle="dropdown" aria-expanded="false" tabindex="-1" data-boundary="viewport">
         <span t-att-class="widget.dropdownIcon"/> <t t-esc="widget.dropdownTitle"/> <span t-if="widget.dropdownSymbol" t-att-class="widget.dropdownSymbol"/>
     </button>
     <div class="dropdown-menu o_dropdown_menu" role="menu">