diff --git a/stage3/03-kernel-setup/00-run.sh b/stage3/03-kernel-setup/00-run.sh
index 6284135..cd6a43b 100755
--- a/stage3/03-kernel-setup/00-run.sh
+++ b/stage3/03-kernel-setup/00-run.sh
@@ -1,3 +1,3 @@
 on_chroot << EOF
-    echo -n ' threadirqs' >> /boot/cmdline.txt
+    sed -i 's/$/ threadirqs/' /boot/cmdline.txt
 EOF