diff --git a/src.ts/providers/format.ts b/src.ts/providers/format.ts
index 5b1bd4ed7..051f999ce 100644
--- a/src.ts/providers/format.ts
+++ b/src.ts/providers/format.ts
@@ -219,6 +219,7 @@ export function formatTransactionResponse(value: any): TransactionResponseParams
 
         chainId: allowNull(getBigInt, null)
     }, {
+        index: [ "transactionIndex" ],
         data: [ "input" ],
         gasLimit: [ "gas" ]
     })(value);