diff --git a/script/file_manage.sh b/script/file_manage.sh
index 3a79621..3c6258f 100644
--- a/script/file_manage.sh
+++ b/script/file_manage.sh
@@ -110,7 +110,7 @@ ncheck=$2
 bar_len=$3
 prefix=$4
 N=$5
-slurm=${6:slurm}
+slurm=${6:-slurm}
 
 time_lap=$(($1/$2))