diff --git a/.changeset/grumpy-parrots-wonder.md b/.changeset/grumpy-parrots-wonder.md
new file mode 100644
index 0000000000..1942021760
--- /dev/null
+++ b/.changeset/grumpy-parrots-wonder.md
@@ -0,0 +1,5 @@
+---
+'@swisspost/design-system-components': patch
+---
+
+Fixed an issue with the post-collapsible throwing an invalid selector error.
diff --git a/packages/components/src/components/post-collapsible/post-collapsible.tsx b/packages/components/src/components/post-collapsible/post-collapsible.tsx
index 6bf09804d5..85b8a04165 100644
--- a/packages/components/src/components/post-collapsible/post-collapsible.tsx
+++ b/packages/components/src/components/post-collapsible/post-collapsible.tsx
@@ -87,7 +87,7 @@ export class PostCollapsible {
    */
   private updateTriggers() {
     const triggers: NodeListOf<HTMLPostCollapsibleTriggerElement> = document.querySelectorAll(
-      `post-collapsible-trigger[for=${this.host.id}]`,
+      `post-collapsible-trigger[for="${this.host.id}"]`,
     );
 
     triggers.forEach(trigger => trigger.update());