diff --git a/parts/22-query.sh b/parts/22-query.sh
index 718646e..ae3d6a2 100644
--- a/parts/22-query.sh
+++ b/parts/22-query.sh
@@ -2625,7 +2625,7 @@ query_monthly-jobs-by-new-multiday-users() { ##? [month]: Number of jobs run by
 			 2024-02 |                                        2771
 	EOF
 
-	if [ $# -eq 0 ]; then
+	if [[ -z "$arg_month" ]]; then
 		arg_month=$(date +%Y-%m)
 	fi