diff --git a/lib/kadm5/admin.h b/lib/kadm5/admin.h
index ff5b6469d..1540f393c 100644
--- a/lib/kadm5/admin.h
+++ b/lib/kadm5/admin.h
@@ -66,6 +66,7 @@
 #define KRB5_KDB_NEW_PRINC		0x00008000
 #define KRB5_KDB_OK_AS_DELEGATE		0x00010000
 #define KRB5_KDB_TRUSTED_FOR_DELEGATION	0x00020000
+#define KRB5_KDB_ALLOW_KERBEROS4	0x00040000
 
 #define KADM5_PRINCIPAL		0x000001
 #define KADM5_PRINC_EXPIRE_TIME	0x000002