diff --git a/.changeset/early-baboons-cross.md b/.changeset/early-baboons-cross.md
new file mode 100644
index 0000000000..2d21811616
--- /dev/null
+++ b/.changeset/early-baboons-cross.md
@@ -0,0 +1,5 @@
+---
+'@swisspost/design-system-components': patch
+---
+
+Added a `type="button"` attribute to the `post-close-button` to prevent it from submitting forms.
diff --git a/packages/components/src/components/post-closebutton/post-closebutton.tsx b/packages/components/src/components/post-closebutton/post-closebutton.tsx
index 0d447ab844..fbd679d15c 100644
--- a/packages/components/src/components/post-closebutton/post-closebutton.tsx
+++ b/packages/components/src/components/post-closebutton/post-closebutton.tsx
@@ -14,7 +14,7 @@ export class PostClosebutton {
   render() {
     return (
       <Host data-version={version}>
-        <button class="btn btn-icon-close">
+        <button class="btn btn-icon-close" type="button">
           <post-icon aria-hidden="true" name="closex"></post-icon>
           <span class="visually-hidden">
             <slot></slot>