diff --git a/Rsconscript b/Rsconscript
index eefc7db..c4b7220 100644
--- a/Rsconscript
+++ b/Rsconscript
@@ -159,7 +159,7 @@ task "run", desc: "Run HOS in QEMU" do
   Dir.mktmpdir do |tmpdir|
     img = hello_env.expand("^/HOS.img")
     FileUtils.cp(img, tmpdir)
-    sh %W[qemu-system-x86_64 -bios OVMF.fd -drive file=#{tmpdir}/HOS.img,format=raw -device qemu-xhci -device usb-tablet]
+    sh %W[qemu-system-x86_64 -cpu max -bios OVMF.fd -drive file=#{tmpdir}/HOS.img,format=raw -device qemu-xhci -device usb-tablet]
   end
 end