diff --git a/wp-includes/functions-formatting.php b/wp-includes/functions-formatting.php
index 95fa576cc9..ff0da469ca 100644
--- a/wp-includes/functions-formatting.php
+++ b/wp-includes/functions-formatting.php
@@ -227,7 +227,7 @@ function sanitize_title_with_dashes($title) {
 
     $title = strtolower($title);
     $title = preg_replace('/&.+?;/', '', $title); // kill entities
-    $title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
+    $title = preg_replace('/[^a-z0-9 _-]/', '', $title);
     $title = preg_replace('/\s+/', '-', $title);
     $title = preg_replace('|-+|', '-', $title);
     $title = trim($title, '-');
@@ -573,4 +573,4 @@ function human_time_diff( $from, $to = '' ) {
 	return $since;
 }
 
-?>
\ No newline at end of file
+?>