diff --git a/release/Makefile b/release/Makefile
index 8489434087a5..978275878683 100644
--- a/release/Makefile
+++ b/release/Makefile
@@ -221,6 +221,9 @@ CRUNCH_TARGETS=	boot fixit
 EXTRAS= cdrom.1 ftp.1
 .if defined(MAKE_ISOS)
 EXTRAS+= iso.1
+.if ${MACHINE} != "pc98"
+BOOTABLE="-b"
+.endif
 .endif
 
 .if !defined(NODOC)
@@ -784,13 +787,13 @@ cdrom.1:
 iso.1:
 	@if [ -r ${.CURDIR}/${MACHINE_ARCH}/mkisoimages.sh ]; then \
 		echo "Creating ISO images..."; \
-		sh ${.CURDIR}/${MACHINE_ARCH}/mkisoimages.sh -b fbsd_miniinst \
-		  ${CD}/miniinst.iso ${CD_DISC1}; \
-		sh ${.CURDIR}/${MACHINE_ARCH}/mkisoimages.sh -b fbsd_livefs \
-		  ${CD}/disc2.iso ${CD_DISC2}; \
+		sh ${.CURDIR}/${MACHINE_ARCH}/mkisoimages.sh ${BOOTABLE} \
+		  fbsd_miniinst ${CD}/miniinst.iso ${CD_DISC1}; \
+		sh ${.CURDIR}/${MACHINE_ARCH}/mkisoimages.sh ${BOOTABLE} \
+		  fbsd_livefs ${CD}/disc2.iso ${CD_DISC2}; \
 		if [ "x${CD_EXTRA_BITS}" != "x" ]; then \
-			sh ${.CURDIR}/${MACHINE_ARCH}/mkisoimages.sh -b fbsd_boot \
-			  ${CD}/disc1.iso ${CD_DISC1} ${CD_EXTRA_BITS}; \
+			sh ${.CURDIR}/${MACHINE_ARCH}/mkisoimages.sh ${BOOTABLE} \
+			  fbsd_boot ${CD}/disc1.iso ${CD_DISC1} ${CD_EXTRA_BITS}; \
 			    && false; \
 		fi \
 	else \