diff --git a/addons/web/static/src/core/dialog/dialog.xml b/addons/web/static/src/core/dialog/dialog.xml
index 75c761c81d4..4224ceabf59 100644
--- a/addons/web/static/src/core/dialog/dialog.xml
+++ b/addons/web/static/src/core/dialog/dialog.xml
@@ -5,7 +5,7 @@
         <div class="o_dialog" t-att-id="id" t-att-class="{ o_inactive_modal: !data.isActive }">
             <div role="dialog" class="modal d-block"
                 tabindex="-1"
-                t-att-class="{ o_technical_modal: props.technical, o_modal_full: isFullscreen }"
+                t-att-class="{ o_technical_modal: props.technical, o_modal_full: isFullscreen, o_inactive_modal: !data.isActive }"
                 t-ref="modalRef"
                 >
                 <div class="modal-dialog modal-dialog-centered" t-attf-class="modal-{{props.size}}">