diff --git a/wp-includes/js/customize-controls.dev.js b/wp-includes/js/customize-controls.dev.js
index d16b91514..359bf35d9 100644
--- a/wp-includes/js/customize-controls.dev.js
+++ b/wp-includes/js/customize-controls.dev.js
@@ -160,9 +160,11 @@
 	});
 
 	api.ImageControl = api.UploadControl.extend({
-		ready: function( id, value, options ) {
+		ready: function() {
 			var control = this;
 
+			api.UploadControl.prototype.ready.call( this );
+
 			this.thumbnail    = this.container.find('.thumbnail img');
 			this.thumbnailSrc = $.proxy( this.thumbnailSrc, this );
 			this.setting.bind( this.thumbnailSrc );