diff --git a/ssh/restrict_ssh_access/restrict_ssh_access.sh b/ssh/restrict_ssh_access/restrict_ssh_access.sh
index 51c2256..34c4854 100644
--- a/ssh/restrict_ssh_access/restrict_ssh_access.sh
+++ b/ssh/restrict_ssh_access/restrict_ssh_access.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # 获取命令行参数
-while getopts "4:6:" opt; do
+while getopts ":4:6:" opt; do
   case $opt in
     4) ALLOWED_IPV4="$OPTARG"
     ;;