diff --git a/src/patterns/04-components/details/details.twig b/src/patterns/04-components/details/details.twig
index 5dabdab5a3257e499f67fdee2cd2cb6845714d3d..c5e23480545b455b87035b283255caccc39af867 100644
--- a/src/patterns/04-components/details/details.twig
+++ b/src/patterns/04-components/details/details.twig
@@ -1,4 +1,4 @@
-<details class="uw-details {{ details_classes }}" {% if details.is_open %} open{% endif %}>
+<details class="uw-details {{ details_classes }}" {% if details.is_open or is_open %} open{% endif %}>
   <summary class="details__summary">
     {% block details_summary %}