diff --git a/lib/util-iso-log.sh b/lib/util-iso-log.sh
index 697ac1f..9813d8d 100644
--- a/lib/util-iso-log.sh
+++ b/lib/util-iso-log.sh
@@ -27,8 +27,7 @@ error_function() {
 # $1: function
 run_log(){
 	local func="$1" name=$(gen_iso_fn)
-	local tmpfile=/tmp/$name.$func.log logfile=${log_dir}/$name.log
-	[[ -f $logfile ]] && rm $logfile
+	local tmpfile=/tmp/$name.$func.log logfile=${log_dir}/$name.$func.log
 	logpipe=$(mktemp -u "/tmp/logpipe.XXXXXXXX")
 	mkfifo "$logpipe"
 	tee "$tmpfile" < "$logpipe" &
@@ -36,7 +35,7 @@ run_log(){
 	$func &> "$logpipe"
 	wait $teepid
 	rm "$logpipe"
-	cat $tmpfile | perl -pe 's/\e\[?.*?[\@-~]//g' >> $logfile
+	cat $tmpfile | perl -pe 's/\e\[?.*?[\@-~]//g' > $logfile
 	rm "$tmpfile"
 }