diff --git a/pykolab/utils.py b/pykolab/utils.py
--- a/pykolab/utils.py
+++ b/pykolab/utils.py
@@ -387,6 +387,12 @@
         if not result.has_key('domain') and result.has_key('standard_domain'):
             result['domain'] = result['standard_domain']
 
+        if 'objectclass' in result and result['objectclass'] is not None:
+            oclist = result['objectclass'] if isinstance(result['objectclass'], list) else [result['objectclass']]
+            result['objectclass'] = [x.lower() for x in oclist]
+        else:
+            result['objectclass'] = []
+
         return result
 
 def parse_input(_input, splitchars= [ ' ' ]):