diff --git a/scripts/mash_run.sh b/scripts/mash_run.sh
index 4fa421a..9a595cf 100755
--- a/scripts/mash_run.sh
+++ b/scripts/mash_run.sh
@@ -214,5 +214,5 @@ do
 done
 
 wait
-rm $pidfile
+( ! $optiont ) && rm $pidfile
 exit 0