diff --git a/master/master.cfg b/master/master.cfg
index 771a05337..205922b94 100644
--- a/master/master.cfg
+++ b/master/master.cfg
@@ -107,13 +107,14 @@ c = BuildmasterConfig = {}
 
 c["db_url"] = str(settings.db_url)
 
-# horizons
-c["changeHorizon"] = 300
-
-# configure a janitor which will delete all logs older than one month,
+# configure a janitor which will delete all logs older than 6 months,
 # and will run on sundays at noon
 c["configurators"] = [
-    util.JanitorConfigurator(logHorizon=timedelta(weeks=4), hour=12, dayOfWeek=6)
+    util.JanitorConfigurator(
+        logHorizon=timedelta(days=180),
+        hour=12,
+        dayOfWeek=6,
+    )
 ]
 
 # workers are set up in workers.py