diff --git a/attributs.py b/attributs.py
index 963e1e7..b7f6ba0 100644
--- a/attributs.py
+++ b/attributs.py
@@ -287,9 +287,12 @@ class Attr(object):
 
     def __ne__(self, obj):
         return not self == obj
+
     def __eq__(self, item):
         if isinstance(item, self.__class__):
             return str(self) == str(item)
+        elif isinstance(item, Attr) and item.python_type == self.python_type:
+            return item.value == self.value
         elif self.python_type and isinstance(item, self.python_type):
             return self.value == item
         elif isinstance(item, str):
@@ -306,7 +309,10 @@ class Attr(object):
             return self.value.__cmp__(obj)
 
     def __nonzero__(self):
-        return self.value.__nonzero__()
+        if self.value:
+            return True
+        else:
+            return False
 
     def parse_value(self, val):
         """Transforme l'attribut pour travailler avec notre validateur
@@ -719,6 +725,7 @@ class solde(Attr):
 class dnsAttr(Attr):
     category = 'dns'
     ldap_name = "dnsAttr"
+    python_type = unicode
 
     def parse_value(self, val):
         val = val.lower()