diff --git a/config/cron/crontab b/config/cron/crontab
index 7762a56ff..b727531fc 100644
--- a/config/cron/crontab
+++ b/config/cron/crontab
@@ -65,8 +65,8 @@ HOME=/
 # Perform a surciata rules update every 12 hours.
 @ 12h [ -f "/var/ipfire/red/active" ] && /usr/local/bin/update-ids-ruleset >/dev/null 2>&1
 
-# Update Lists for IP-based blocking.
-%hourly,random * [ -f "/var/ipfire/red/active" ] && /usr/local/bin/update-ipblocklists >/dev/null 2>&1
+# Update Lists for IP-based blocking every 15 minutes.
+@ 15 [ -f "/var/ipfire/red/active" ] && /usr/local/bin/update-ipblocklists >/dev/null 2>&1
 
 # Retry sending spooled mails regularly
 %hourly * /usr/sbin/dma -q