diff --git a/source3/include/smb_macros.h b/source3/include/smb_macros.h
index f1191ac011e..06d24744960 100644
--- a/source3/include/smb_macros.h
+++ b/source3/include/smb_macros.h
@@ -214,6 +214,7 @@ copy an IP address from one buffer to another
 *****************************************************************************/
 
 #define IS_DC  (lp_server_role()==ROLE_DOMAIN_PDC || lp_server_role()==ROLE_DOMAIN_BDC || lp_server_role() == ROLE_ACTIVE_DIRECTORY_DC) 
+#define IS_AD_DC  (lp_server_role() == ROLE_ACTIVE_DIRECTORY_DC)
 
 /*
  * If you add any entries to KERBEROS_VERIFY defines, please modify the below expressions