diff --git a/hw/boards.h b/hw/boards.h
index eacd324..22ac332 100644
--- a/hw/boards.h
+++ b/hw/boards.h
@@ -64,6 +64,7 @@
 
 /* sun4u.c */
 extern QEMUMachine sun4u_machine;
+extern QEMUMachine sun4v_machine;
 
 /* integratorcp.c */
 extern QEMUMachine integratorcp_machine;