diff --git a/phpseclib/File/ASN1.php b/phpseclib/File/ASN1.php
index b33cdd4e..90490b3d 100644
--- a/phpseclib/File/ASN1.php
+++ b/phpseclib/File/ASN1.php
@@ -844,7 +844,7 @@ class ASN1
                         NOTE - The padding octets are for comparison purposes only and do not appear in the encodings."
 
                        -- sec 11.6 of http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf  */
-                    if ($mapping['type'] == FILE_ASN1_TYPE_SET) {
+                    if ($mapping['type'] == self::TYPE_SET) {
                         sort($value);
                     }
                     $value = implode($value, '');