diff --git a/attributs.py b/attributs.py
index ed0652d..0134a86 100644
--- a/attributs.py
+++ b/attributs.py
@@ -1517,7 +1517,8 @@ class userPassword(rightProtectedAttr):
         comprendre"""
 
         matched = HASH_RE.match(self.value)
-        groupdict = {}.update(matched.groupdict())
+        groupdict = {}
+        groupdict.update(matched.groupdict())
         groupdict['method'] = groupdict['method'].upper()
         return unicode("{%(method)s}%(hash)s" % groupdict)