diff --git a/lib/default.nix b/lib/default.nix
index 05b3a36..68afd91 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -116,7 +116,7 @@ in {
       preferLocalBuild = true;
       dontUnpack = true;
 
-      buildInputs = [ testPkgs.stdenv.cc hostPkgs.cdrkit ];
+      buildInputs = [ testPkgs.stdenv.cc hostPkgs.cdrkit hostPkgs.syslinux ];
 
       buildPhase = ''
         mkdir -p boot/syslinux
@@ -151,6 +151,8 @@ in {
         	-iso-level 2 \
         	boot
 
+        isohybrid iso
+
         # build test script
         cat > boot-qemu << EOF
         #!/bin/sh