diff --git a/addons/web/static/src/less/bootstrap_overridden.less b/addons/web/static/src/less/bootstrap_overridden.less
index ada94dbf4ca..ca6383e0116 100644
--- a/addons/web/static/src/less/bootstrap_overridden.less
+++ b/addons/web/static/src/less/bootstrap_overridden.less
@@ -83,7 +83,10 @@
 //
 // Note that the variable @zindex-modal-background may be renamed/removed in
 // newer versions of bootstrap.
-@zindex-modal-background: @zindex-modal;
+//
+// TODO the following code was disabled because it is saas-incompatible
+//
+// @zindex-modal-background: @zindex-modal;
 
 //== Navs
 @nav-link-padding: 10px 15px;
diff --git a/addons/web/static/src/less/modal.less b/addons/web/static/src/less/modal.less
index ec96d06b67e..a223deb55ef 100644
--- a/addons/web/static/src/less/modal.less
+++ b/addons/web/static/src/less/modal.less
@@ -79,6 +79,9 @@
 
 // Temporary fix for modals which are not instantiated thanks to the Dialog
 // JS classes (deprecated case) (see bootstrap_overridden.less) + Frontend.
-:not(body) > .modal {
-    z-index: @zindex-modal-background + 1;
-}
+//
+// TODO the following code was disabled because it is saas-incompatible
+//
+// :not(body) > .modal {
+//     z-index: @zindex-modal-background + 1;
+// }