diff --git a/source/components/layout/slider.mjs b/source/components/layout/slider.mjs
index ad1710df32889c3e5e3bbaed7f3796d7be020cd3..8405c6379125425cbf552a9ddcb945809e1901cb 100644
--- a/source/components/layout/slider.mjs
+++ b/source/components/layout/slider.mjs
@@ -745,7 +745,7 @@ function getTemplate() {
             <div data-monster-role="slider" part="slides">
                 <slot></slot>
             </div>
-            <div data-monster-role="thumbnails"></div>
+            <div data-monster-role="thumbnails" part="thumbnails"></div>
             <div class="next" data-monster-role="next" part="next" part="next">
                 <slot name="next"></slot>
             </div>