Index: head/sys/boot/common/install.c
===================================================================
--- head/sys/boot/common/install.c
+++ head/sys/boot/common/install.c
@@ -286,7 +286,7 @@
 	}
 
 	s = (inst_rootfs == NULL) ? "/install.iso" : inst_rootfs;
-	if (file_loadraw(s, "mfs_root") == NULL) {
+	if (file_loadraw(s, "mfs_root", 1) == NULL) {
 		error = errno;
 		command_errmsg = "cannot load root file system";
 		goto fail;