diff --git a/Dockerfile b/Dockerfile
index 8cf17129b4948b98ddb1736d80ac59b8ed44d964..b7cbbbe6378901e3e9bb341dc4ebe4205eea49d1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,4 +16,5 @@ USER nobody
 CMD [ "supersonic", "/crontab" ]
 HEALTHCHECK CMD pgrep supersonic
 RUN supersonic -test /crontab
+ONBUILD COPY crontab /crontab
 ONBUILD RUN supersonic -test /crontab