diff --git a/first/local.h.src b/first/local.h.src
index 439d62dc7..37ec5d75b 100644
--- a/first/local.h.src
+++ b/first/local.h.src
@@ -4,4 +4,4 @@
 #	define	VERSION		3	/* 16 bits number */
 
 /* The default machine used by ack, acc, apc */
-#	define	ACKM		"vax2"
+#	define	ACKM		"vax4"