diff --git a/TransferApproval.sol b/TransferApproval.sol
index 554b716..45eca6f 100644
--- a/TransferApproval.sol
+++ b/TransferApproval.sol
@@ -24,7 +24,7 @@ interface TransferApproval {
 	function lastSerial() external view returns (uint256);
 	function nextSerial() external view returns (uint256);
 	function getSerialAt(uint256 _idx) external view returns (uint256);
-	function requests(uint256 _idx) external view returns (Transaction memory);
+	function requests(uint256 _serial) external view returns (Transaction memory);
 	function createRequest(address _recipient, address _token, uint256 _value) external returns (uint256);
 	function executeRequest(uint256 _serial) external returns (bool);
 	function rejectRequest(uint256 _serial) external returns (bool);