diff --git a/src/components/chain/contract/Locker.js b/src/components/chain/contract/Locker.js
index 6e588f8..1c7d6ce 100644
--- a/src/components/chain/contract/Locker.js
+++ b/src/components/chain/contract/Locker.js
@@ -124,6 +124,6 @@ export class Locker {
       throw new Error(errmsg)
     }
     trans_req.from = address
-    return this.sendUnlockOrMint(this.bc.web3Provider, trans_req)
+    return this.sendUnlockOrMint(this.bc.passportProvider, trans_req)
   }
 }