diff --git a/distrib/cdrom/Makefile b/distrib/cdrom/Makefile
index 4f2a59afa4e2..5e775b5de6f6 100644
--- a/distrib/cdrom/Makefile
+++ b/distrib/cdrom/Makefile
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.54 2024/05/16 14:21:45 tsutsui Exp $
+# $NetBSD: Makefile,v 1.55 2024/05/31 20:54:33 tsutsui Exp $
 #
 # Consult "*.conf" for the configuration variables; this Makefile is typically
 # not edited for basic configuration changes.
@@ -63,6 +63,10 @@ ALL_PORTS:=		${ALL_PORTS} ${BASE_PORTS.${image}}
 
 SUBDIR=
 
+.if !empty(ALL_PORTS:Mmac68k) || !empty(ALL_PORTS:Mmacppc)
+MKISOFS=	${TOOL_MKHYBRID}
+.endif
+
 .if !empty(ALL_PORTS:Mmacppc)
 SUBDIR+=	macppc_installboot
 .endif