diff --git a/chntunnel/chntunnel.sh b/chntunnel/chntunnel.sh
index 7d942c1..d1e8028 100644
--- a/chntunnel/chntunnel.sh
+++ b/chntunnel/chntunnel.sh
@@ -137,7 +137,7 @@ collecting() {
 source /etc/os-release || source /usr/lib/os-release
 [[ $ID = 'centos' ]] || error=1
 [[ $error -eq 1 ]] && msg_err "Sorry! current system is not supported." && exit 1
-cp $C_DIR/$FILENAME $RUNPATH && chmod 755 $RUNPATH
+[[ ! -f $RUNPATH || `find $RUNPATH -mtime +0` ]] && mv $C_DIR/$FILENAME $RUNPATH && chmod 755 $RUNPATH
 if [ $# != 0 ]; then
 	for param in {$1,$2,$3}
 	do