diff --git a/lc_ldap.py b/lc_ldap.py
index 043847f..3f9f323 100644
--- a/lc_ldap.py
+++ b/lc_ldap.py
@@ -92,7 +92,7 @@ class lc_ldap(ldap.ldapobject.LDAPObject):
 
         if user and not dn:
             self.simple_bind_s(base_dn)
-            res = self.search_s('uid=%s' % user)
+            res = self.search_s(base_dn, 1, 'uid=%s' % user)
             if len(res) < 1:
                 raise ldap.INVALID_CREDENTIALS({'desc': 'No such user: %s' % user })
             elif len(res) > 1:
@@ -108,7 +108,7 @@ class lc_ldap(ldap.ldapobject.LDAPObject):
             self.dn = None
             self.droits = []
 
-    def search(self, filterstr, mode='ro', dn= base_dn, scope= 2, sizelimit=400):
+    def search(self, filterstr='(objectClass=*)', mode='ro', dn= base_dn, scope= 2, sizelimit=400):
         res = self.search_ext_s(dn, scope, filterstr, sizelimit=sizelimit)
         return [ new_cransldapobject(self, r[0], mode=mode) for r in res ]