diff --git a/src/wp-includes/js/media-editor.js b/src/wp-includes/js/media-editor.js
index 703a1869cf..39d8774d5b 100644
--- a/src/wp-includes/js/media-editor.js
+++ b/src/wp-includes/js/media-editor.js
@@ -406,7 +406,7 @@
 			}
 
  			// Remove default attributes from the shortcode.
- 			_.each( this.defaults, function( value, key ) {
+ 			_.each( wp.media[prop].defaults, function( value, key ) {
  				if ( value === attrs[ key ] ) {
  					delete attrs[ key ];
 				}