diff --git a/ts/sdk/src/request-signer.ts b/ts/sdk/src/request-signer.ts
index ccbb2967..1b1a08fb 100644
--- a/ts/sdk/src/request-signer.ts
+++ b/ts/sdk/src/request-signer.ts
@@ -37,6 +37,7 @@ export interface IBluefinSigner {
     txb: TransactionBlock,
     suiClient: SuiClient
   ) => Promise<DryRunTransactionBlockResponse | SuiTransactionBlockResponse>;
+  isUIWallet(): boolean;
 }
 
 export interface ISigner {