diff --git a/wp-includes/functions-post.php b/wp-includes/functions-post.php
index 842980f6c2..e9319ba966 100644
--- a/wp-includes/functions-post.php
+++ b/wp-includes/functions-post.php
@@ -643,6 +643,8 @@ function wp_blacklist_check($author, $email, $url, $comment, $user_ip, $user_age
 	if ( preg_match_all('/&#(\d+);/', $comment . $author . $url, $chars) ) {
 		foreach ($chars[1] as $char) {
 			// If it's an encoded char in the normal ASCII set, reject
+			if ( 38 == $char )
+				continue; // Unless it's &
 			if ($char < 128)
 				return true;
 		}