diff --git a/run b/run
index 117553f..105f42d 100755
--- a/run
+++ b/run
@@ -42,7 +42,7 @@ case "$arch" in
 esac
 
 cd kernel_module
-./make-host.sh clean
+./make-host.sh -j "$j" clean
 cd ../buildroot
 for p in $(find '../buildroot_patches/' -maxdepth 1 -name '*.patch' -print); do
     patch -N -r - -p 1 <"$p" || :