diff --git a/asn1crypto/x509.py b/asn1crypto/x509.py
index <HASH>..<HASH> 100644
--- a/asn1crypto/x509.py
+++ b/asn1crypto/x509.py
@@ -363,7 +363,7 @@ class RelativeDistinguishedName(SetOf):
         """
 
         output = []
-        values = self._get_values()
+        values = self._get_values(self)
         for key in sorted(values.keys()):
             output.append('%s: %s' % (key, values[key]))
         # Unit separator is used here since the normalization process for
Fix generating the hashable version of an x<I>.RelativeDistinguishedName