diff --git a/entrypoint.sh b/entrypoint.sh
index fddb86e..bff578b 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 set -e
 
+[ -z "$CRON_SCHEDULE" ] && CRON_SCHEDULE="1/15 * * * *"
+
 echo "$CRON_SCHEDULE /usr/local/bin/php /opt/phpipam-agent/index.php update > /proc/self/fd/1 2>/proc/self/fd/2" > $CRONTAB_FILE
 echo "$CRON_SCHEDULE /usr/local/bin/php /opt/phpipam-agent/index.php discover > /proc/self/fd/1 2>/proc/self/fd/2" >> $CRONTAB_FILE
 chmod 0644 $CRONTAB_FILE