diff --git a/js/block-styles.js b/js/block-styles.js
index 38ccbed..32b629d 100644
--- a/js/block-styles.js
+++ b/js/block-styles.js
@@ -1,6 +1,6 @@
 wp.domReady( () => {
   wp.blocks.registerBlockStyle(
-    'core/', {
+    'core/heading', {
     name: 'tabbed-heading',
     label: 'Tabbed Heading',
   }