diff --git a/contracts/interfaces/ITransfers.sol b/contracts/interfaces/ITransfers.sol
index e8bd4b1..bc3564d 100644
--- a/contracts/interfaces/ITransfers.sol
+++ b/contracts/interfaces/ITransfers.sol
@@ -23,7 +23,7 @@ struct TransferIntent {
     address recipientCurrency;
     address refundDestination;
     uint256 feeAmount;
-    bytes16 id;
+    bytes32 id;
     address operator;
     bytes signature;
     bytes prefix;
@@ -52,7 +52,7 @@ interface ITransfers {
     // @param spentCurrency What currency the payer sent
     event Transferred(
         address indexed operator,
-        bytes16 id,
+        bytes32 id,
         address recipient,
         address sender,
         uint256 spentAmount,
diff --git a/contracts/transfers/Transfers.sol b/contracts/transfers/Transfers.sol
index fb19d7a..4e9967f 100644
--- a/contracts/transfers/Transfers.sol
+++ b/contracts/transfers/Transfers.sol
@@ -34,7 +34,7 @@ contract Transfers is Context, Ownable, Pausable, ReentrancyGuard, Sweepable, IT
     mapping(address => address) private feeDestinations;
 
     // @dev Map of operator addresses to a map of transfer intent ids that have been processed
-    mapping(address => mapping(bytes16 => bool)) private processedTransferIntents;
+    mapping(address => mapping(bytes32 => bool)) private processedTransferIntents;
 
     // @dev Represents native token of a chain (e.g. ETH or MATIC)
     address private immutable NATIVE_CURRENCY = address(0);