diff --git a/scripts/clean_buffer.cron b/scripts/clean_buffer.cron
new file mode 100644
index 0000000..b90262b
--- /dev/null
+++ b/scripts/clean_buffer.cron
@@ -0,0 +1,3 @@
+heck every hour if buffer is occupied for larger then 80% and remove all files older then 3 hours
+10 * * * * root /home/dbe/git/sf_daq_buffer/scripts/delete_old_files_in_buffer.sh 80 5
+
diff --git a/scripts/delete_old_files_in_buffer.sh b/scripts/delete_old_files_in_buffer.sh
index ddcfed1..e461708 100755
--- a/scripts/delete_old_files_in_buffer.sh
+++ b/scripts/delete_old_files_in_buffer.sh
@@ -3,11 +3,11 @@
 hours=5
 threshold=80
 
-if [ $# = 1 ]
+if [ $# -ge 1 ]
 then
     threshold=$1
 fi
-if [ $# = 2 ]
+if [ $# -eq 2 ]
 then
     hours=$2
 fi