diff --git a/wp-includes/pluggable.php b/wp-includes/pluggable.php
index 96241273a7..67c3a9d9d9 100644
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -876,7 +876,7 @@ if ( !function_exists('wp_sanitize_redirect') ) :
  * @return string redirect-sanitized URL
  **/
 function wp_sanitize_redirect($location) {
-	$location = preg_replace('|[^a-z0-9-~+_.?#=&;,/:%]|i', '', $location);
+	$location = preg_replace('|[^a-z0-9-~+_.?#=&;,/:%!]|i', '', $location);
 	$location = wp_kses_no_null($location);
 
 	// remove %0d and %0a from location