diff --git a/tests/dummy/app/snippets/modal.hbs b/tests/dummy/app/snippets/modal.hbs
index 68b2fa49..0108a78d 100644
--- a/tests/dummy/app/snippets/modal.hbs
+++ b/tests/dummy/app/snippets/modal.hbs
@@ -6,4 +6,4 @@
   </p>
 {{/uk-modal}}
 
-{{uk-button label="Open modal" on-click=(action (mut visible true))}}
\ No newline at end of file
+{{uk-button label="Open modal" on-click=(action (mut visible) true)}}
\ No newline at end of file