diff --git a/docker/Dockerfile b/docker/Dockerfile
index 3e1b25e..0b0c1cf 100755
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -21,10 +21,11 @@ ADD https://api.github.com/repos/chrisb86/nsupdate/git/refs/heads/main /.git-has
 COPY nsupdate.sh /usr/local/bin/nsupdate.sh
 RUN chmod +x /usr/local/bin/nsupdate.sh
 
-COPY docker/entrypoint.sh /entrypoint.sh
-RUN chmod +x /entrypoint.sh
-ENTRYPOINT ["/entrypoint.sh"]
-CMD ["cron","-f", "-l", "2"]
+## Setup cron job
+RUN echo "${SCHEDULE} sh /usr/local/bin/nsupdate.sh" >> /etc/crontabs/root
+
+## Start crond
+CMD [ "crond", "-l", "2", "-f" ]
 
 VOLUME /config
 VOLUME /log