diff --git a/inception/inception-bootstrap/src/main/ts/bootstrap/shim-wicket.scss b/inception/inception-bootstrap/src/main/ts/bootstrap/shim-wicket.scss
index 59a13fcc588..65be4558d9c 100644
--- a/inception/inception-bootstrap/src/main/ts/bootstrap/shim-wicket.scss
+++ b/inception/inception-bootstrap/src/main/ts/bootstrap/shim-wicket.scss
@@ -22,4 +22,9 @@ a.tree-junction {
 
 .modal-dialog .modal-dialog-content {
   font-size: initial;
+}
+
+.dialog-theme-default .modal-dialog-overlay {
+  // z-index 1020 is in Bootstrap's .sticky-top and we need to be above that
+  z-index: 1030;
 }
\ No newline at end of file