diff --git a/server/web3sign/controllers/activate721nft.js b/server/web3sign/controllers/activate721nft.js
index 861b4b2..880e787 100644
--- a/server/web3sign/controllers/activate721nft.js
+++ b/server/web3sign/controllers/activate721nft.js
@@ -91,7 +91,7 @@ async function activate721Nft(session) {
     ];
     let nftListStr = '';
     nftList.forEach((item) => {
-      nftListStr += item['tokenId'].toString() + '1';
+      nftListStr += item['tokenId'].toString() + '0x01';
     });
     const signature = await bc.soliditySha3Sign(
       account,