diff --git a/wp-includes/comment-functions.php b/wp-includes/comment-functions.php
index 1385952de..f322c871b 100644
--- a/wp-includes/comment-functions.php
+++ b/wp-includes/comment-functions.php
@@ -230,15 +230,6 @@ function wp_delete_comment($comment_id) {
 	return true;
 }
 
-function clean_url( $url ) {
-	if ('' == $url) return $url;
-	$url = preg_replace('|[^a-z0-9-~+_.?#=&;,/:]|i', '', $url);
-	$url = str_replace(';//', '://', $url);
-	$url = (!strstr($url, '://')) ? 'http://'.$url : $url;
-	$url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url);
-	return $url;
-}
-
 function get_comments_number( $post_id = 0 ) {
 	global $wpdb, $comment_count_cache, $id;
 	$post_id = (int) $post_id;
diff --git a/wp-includes/functions-formatting.php b/wp-includes/functions-formatting.php
index 63731a5b0..e2d3b7e45 100644
--- a/wp-includes/functions-formatting.php
+++ b/wp-includes/functions-formatting.php
@@ -1023,4 +1023,13 @@ function wp_richedit_pre($text) {
 	return apply_filters('richedit_pre', $output);
 }
 
+function clean_url( $url ) {
+	if ('' == $url) return $url;
+	$url = preg_replace('|[^a-z0-9-~+_.?#=&;,/:]|i', '', $url);
+	$url = str_replace(';//', '://', $url);
+	$url = (!strstr($url, '://')) ? 'http://'.$url : $url;
+	$url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url);
+	return $url;
+}
+
 ?>