diff --git a/run-restic.sh b/run-restic.sh
index cba39d3..b0d9b8a 100755
--- a/run-restic.sh
+++ b/run-restic.sh
@@ -51,7 +51,7 @@ fi
 # run the snapshot
 ARGS="-r $DST --password-file $PW backup --tag $TAG --exclude-file=/restic.excludes --files-from /restic.files"
 # clean up old snapshots
-CLEAN="-r $DST --password-file $PW forget --tag $TAG --keep-daily 7 --keep-weekly 5 --keep-monthly 12 --keep-yearly 7"
+CLEAN="-r $DST --password-file $PW forget --prune --tag $TAG --keep-daily 7 --keep-weekly 5 --keep-monthly 12 --keep-yearly 7"
 # create a snapshot
 log "running snapshot"
 $NICE $CMD $ARGS >> $LOG