diff --git a/images/cron/Dockerfile b/images/cron/Dockerfile
index e04cb4e..5e2a7aa 100644
--- a/images/cron/Dockerfile
+++ b/images/cron/Dockerfile
@@ -22,7 +22,7 @@ RUN DEBIAN_FRONTEND=noninteractive  \
 # finally, make sure that this sed script runs every few minutes on all /etc/cron.d files
 RUN rm -rf /etc/cron.*/* \
  && sed -i -r -e 's/^(([/0-9*,-]+\s+){5}|@(reboot|yearly|annually|monthly|weekly|daily|midnight|hourly)\s+)root\s+(.*)/\1\tnobody\t\4/' /etc/crontab \
- && echo "*/15 * * * *  root  sed -i -r -e 's/^(([/0-9*,-]+\s+){5}|@(reboot|yearly|annually|monthly|weekly|daily|midnight|hourly)\s+)root\s+(.*)/\\1\\tnobody\\t\\4/' /etc/cron.d/*" >> /etc/crontab
+ && echo "*/15 * * * *  root  sed -i -r -e 's/^(([/0-9*,-]+\s+){5}|@(reboot|yearly|annually|monthly|weekly|daily|midnight|hourly)\s+)root\s+(.*)/\\\1\\\tnobody\\\t\\\4/' /etc/cron.d/*" >> /etc/crontab
 
 # cron volumes
 VOLUME ["/etc/cron.d", "/etc/cron.daily", "/etc/cron.hourly", "/etc/cron.monthly", "/etc/cron.weekly"]