Ticket #18005: 18005.2.diff

wp-includes/theme.php

@@ -1125 +1125 @@
  */
 function _custom_background_cb() {
         // $background is the saved custom image, or the default image.
-        $background = get_background_image();
+        $background = set_url_scheme( get_background_image() );
 
         // $color is the saved custom color.
         // A default has to be specified in style.css. It will not be printed here.