diff --git a/lib/hdb/hdb.h b/lib/hdb/hdb.h
index e3d372b12..6dc3f6be4 100644
--- a/lib/hdb/hdb.h
+++ b/lib/hdb/hdb.h
@@ -61,6 +61,7 @@ typedef struct hdb_entry{
 	    unsigned allow_postdate:1; /* Ticket may be postdated */
 	    unsigned server:1;	/* Principal may be server */
 	    unsigned locked:1;	/* Principal is locked */
+	    unsigned v4:1;	/* Version 4 salted key */
 	}b;
     }flags;
 }hdb_entry;