diff --git a/sys/arch/acorn32/conf/Makefile.acorn32 b/sys/arch/acorn32/conf/Makefile.acorn32
index b2eb15852d27..322cc2e92429 100644
--- a/sys/arch/acorn32/conf/Makefile.acorn32
+++ b/sys/arch/acorn32/conf/Makefile.acorn32
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile.acorn32,v 1.9 2001/12/09 05:00:40 atatat Exp $
+#	$NetBSD: Makefile.acorn32,v 1.10 2002/01/09 20:54:40 reinoud Exp $
 
 # Makefile for NetBSD
 #
@@ -17,7 +17,7 @@
 #
 #	makeoptions DEBUGLIST="uvm* trap if_*"
 
-MACHINE_ARCH=arm32
+MACHINE_ARCH?=arm32
 USETOOLS?=	no
 NEED_OWN_INSTALL_TARGET?=no
 .include <bsd.own.mk>