diff --git a/check_domain.sh b/check_domain.sh
index a4e5c50..eb5e57f 100755
--- a/check_domain.sh
+++ b/check_domain.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 # check_domain - v2.0.0
 # Author: A. Stoyanov
 # GitHub: https://github.com/a-stoyanov/zabbix-domain-expiry
@@ -47,7 +48,6 @@
 #   - Debug output is enabled with -z and sent to stderr.
 #   - Temporary files are cleaned up on exit.
 
-#!/bin/sh
 set -e
 exec 2>&1
 
@@ -1005,4 +1005,4 @@ if [ $expdays -ge 0 ]; then
 fi
 die "$STATE_CRITICAL" "State: CRITICAL ; Days since expired: ${expdays#-} ; Expire date: $expdate"
 
-exit 0
\ No newline at end of file
+exit 0