diff --git a/public/assets/js/bridge/blocks-placeholder.js b/public/assets/js/bridge/blocks-placeholder.js
index c4004f9..04faa33 100644
--- a/public/assets/js/bridge/blocks-placeholder.js
+++ b/public/assets/js/bridge/blocks-placeholder.js
@@ -630,6 +630,7 @@
         placeholderDefaults.toolbar = baseToolbar;
 
         const PlaceholderModel = BaseModel.extend({
+            defaults: placeholderDefaults,
             init() {
                 this.listenTo(this, 'change:attributes', this.updatePlaceholderState);
                 this.updatePlaceholderState();
@@ -719,8 +720,6 @@
             }
         });
 
-        PlaceholderModel.prototype.defaults = placeholderDefaults;
-
         PlaceholderModel.isComponent = function (el) {
             if (el && el.hasAttribute && el.hasAttribute('data-placeholder-type')) {
                 return { type: PLACEHOLDER_COMPONENT };