diff --git a/src/commands/misc/receive-obsninja-url.js b/src/commands/misc/receive-obsninja-url.js
index d1d8be0..9a2698a 100644
--- a/src/commands/misc/receive-obsninja-url.js
+++ b/src/commands/misc/receive-obsninja-url.js
@@ -15,7 +15,7 @@ class ReceiveObsninjaUrl extends commando.Command {
           key: 'id',
           prompt: '※受信先IDが代入されていません。',
           type: 'string',
-          validate: (id) => id.match(/^[0-9a-zA-Z]+$/),
+          validate: (id) => id.match(/^[0-9a-zA-Z]{1,24}$/),
         },
       ],
     });
diff --git a/src/commands/misc/send-obsninja-url.js b/src/commands/misc/send-obsninja-url.js
index 8713874..d65a771 100644
--- a/src/commands/misc/send-obsninja-url.js
+++ b/src/commands/misc/send-obsninja-url.js
@@ -15,7 +15,7 @@ class SendObsninjaUrl extends commando.Command {
           key: 'id',
           prompt: '※送信先IDが代入されていません。',
           type: 'string',
-          validate: (id) => id.match(/^[0-9a-zA-Z]+$/),
+          validate: (id) => id.match(/^[0-9a-zA-Z]{1,24}$/),
         },
       ],
     });