diff --git a/wp-includes/post-template.php b/wp-includes/post-template.php
index 2a8a2d6bd..ec506d3a4 100644
--- a/wp-includes/post-template.php
+++ b/wp-includes/post-template.php
@@ -223,11 +223,23 @@ function get_the_content($more_link_text = null, $stripteaser = 0) {
 
 	}
 	if ( $preview ) // preview fix for javascript bug with foreign languages
-		$output =	preg_replace_callback('/\%u([0-9A-F]{4})/', create_function('$match', 'return "&#" . base_convert($match[1], 16, 10) . ";";'), $output);
+		$output =	preg_replace_callback('/\%u([0-9A-F]{4})/', '__convert_urlencoded_to_entities', $output);
 
 	return $output;
 }
 
+/**
+ * Preview fix for javascript bug with foreign languages
+ * 
+ * @since 3.1.0
+ * @access private
+ * @param array $match Match array from preg_replace_callback
+ * @returns string
+ */
+function __convert_urlencoded_to_entities($match) {
+	return '&#' . base_convert($match[1], 16, 10) . ';'; 
+}
+
 /**
  * Display the post excerpt.
  *