diff --git a/lib/github/ldap/filter.rb b/lib/github/ldap/filter.rb
index 64f5aa3..6f62af3 100644
--- a/lib/github/ldap/filter.rb
+++ b/lib/github/ldap/filter.rb
@@ -3,7 +3,8 @@ class Ldap
     module Filter
       ALL_GROUPS_FILTER = Net::LDAP::Filter.eq("objectClass", "groupOfNames") |
                           Net::LDAP::Filter.eq("objectClass", "groupOfUniqueNames") |
-                          Net::LDAP::Filter.eq("objectClass", "posixGroup")
+                          Net::LDAP::Filter.eq("objectClass", "posixGroup") |
+                          Net::LDAP::Filter.eq("objectClass", "group")
 
       MEMBERSHIP_NAMES  = %w(member uniqueMember)