diff --git a/tools/qemu-debian-img/bootstrap.sh b/tools/qemu-debian-img/bootstrap.sh
index d468240..7277671 100755
--- a/tools/qemu-debian-img/bootstrap.sh
+++ b/tools/qemu-debian-img/bootstrap.sh
@@ -1,7 +1,7 @@
 #!/bin/sh -eux
 docker build -t gen-ubuntu1804-image .
-RUN="docker run --privileged -v $(pwd):/shared -t gen-ubuntu1804-image"
-$RUN # generate image
-$RUN sh -c 'cp /vmlinuz /shared/ubuntu1804.vmlinuz'
+docker run --privileged -v $(pwd):/shared -t gen-ubuntu1804-image
+RUN="docker run -v $(pwd):/shared -t gen-ubuntu1804-image"
+$RUN sh -c 'chmod 644 /vmlinuz && cp /vmlinuz /shared/ubuntu1804.vmlinuz'
 $RUN sh -c 'cp /initrd.img /shared/ubuntu1804.initrd'
 $RUN sh -c 'cp $(find /lib/modules -name test_static_key_base.ko) /shared/ubuntu1804.ko'