diff --git a/wp-includes/js/tinymce/themes/advanced/js/image.js b/wp-includes/js/tinymce/themes/advanced/js/image.js
index 66c213f7e1..54af100bd6 100644
--- a/wp-includes/js/tinymce/themes/advanced/js/image.js
+++ b/wp-includes/js/tinymce/themes/advanced/js/image.js
@@ -80,7 +80,7 @@ var ImageDialog = {
 			src : f.src.value.replace(/ /g, '%20'),
 			alt : f.alt.value,
 			width : f.width.value,
-			height : f.height.value
+			height : f.height.value,
 			'class' : f.class_name.value
 		});