diff --git a/Makefile.inc1 b/Makefile.inc1
index fff010b6c3ac..54e480a1d775 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -1,5 +1,5 @@
 #
-#	$Id: Makefile.inc1,v 1.25 1998/10/09 22:22:34 jkh Exp $
+#	$Id: Makefile.inc1,v 1.26 1998/10/10 08:21:18 jkh Exp $
 #
 # Make command line options:
 #	-DCLOBBER will remove /usr/include
@@ -896,7 +896,7 @@ legacy-build:
 	cd ${.CURDIR}/sys/boot && ${XMAKE} -DNOMAN -B obj depend; \
 		${XMAKE} -DNOMAN all
 	cd ${.CURDIR}/sys/${MACHINE_ARCH}/boot && \
-		${XMAKE} -DNOMAN -B obj depend; ${XMAKE} -DNOMAN all;
+		${XMAKE} -DNOMAN -B obj depend; ${XMAKE} -DNOMAN OBJFORMAT=elf all;
 .endif
 
 #