diff --git a/AbuseFilter.class.php b/AbuseFilter.class.php
index 88c72c44b..290b40121 100644
--- a/AbuseFilter.class.php
+++ b/AbuseFilter.class.php
@@ -70,6 +70,7 @@ class AbuseFilter {
 			'substr(subject, offset, length)' => 'substr',
 			'strpos(haystack, needle)' => 'strpos',
 			'str_replace(subject, search, replace)' => 'str_replace',
+			'rescape(string)' => 'rescape',
 			'set_var(var,value)' => 'set_var',
 		),
 		'vars' => array(