diff --git a/bundles/backup-server/files/rotate-single-backup-client b/bundles/backup-server/files/rotate-single-backup-client
index b031866..ee49e26 100644
--- a/bundles/backup-server/files/rotate-single-backup-client
+++ b/bundles/backup-server/files/rotate-single-backup-client
@@ -87,7 +87,8 @@ for bucket in INTERVALS.keys():
         syslog(f'something is wrong, there are no snapshots for {bucket}')
         continue
 
-    keep_age = INTERVALS[bucket] * client_settings[bucket]
+    # see comment in zfs-auto-snapshot about doing +1 here
+    keep_age = INTERVALS[bucket] * (client_settings[bucket]+1)
 
     # oldest snapshots come first
     for ts in snapshots[:-int(client_settings[bucket])]: