diff --git a/wp-admin/js/custom-header.js b/wp-admin/js/custom-header.js
index 9243498175..05cc89a9e2 100644
--- a/wp-admin/js/custom-header.js
+++ b/wp-admin/js/custom-header.js
@@ -1,10 +1,13 @@
 (function($) {
+	// Fetch available headers and apply jQuery.masonry
+	// once the images have loaded.
+	$( function() {
+		var $headers = $('.available-headers');
 
-	var headers = $('.available-headers');
-	headers.imagesLoaded( function() {
-		headers.masonry({
-			itemSelector: '.default-header'
+		$headers.imagesLoaded( function() {
+			$headers.masonry({
+				itemSelector: '.default-header'
+			});
 		});
 	});
-
-})(jQuery);
+}(jQuery));