diff --git a/app/ts/types/wire-types.ts b/app/ts/types/wire-types.ts
index 7d567cc2..cdd6d0e8 100644
--- a/app/ts/types/wire-types.ts
+++ b/app/ts/types/wire-types.ts
@@ -340,7 +340,7 @@ const EthereumSignedTransactionOptimismDeposit = funtypes.ReadonlyObject({
 	sourceHash: EthereumBytes32,
 	from: EthereumAddress,
 	to: funtypes.Union(EthereumAddress, funtypes.Null),
-	mint: EthereumQuantity,
+	mint: funtypes.Union(EthereumQuantity, funtypes.Null),
 	value: EthereumQuantity,
 	gas: EthereumQuantity,
 	data: EthereumInput,
diff --git a/app/ts/utils/ethereum.ts b/app/ts/utils/ethereum.ts
index ed51a72a..0f5a21e6 100644
--- a/app/ts/utils/ethereum.ts
+++ b/app/ts/utils/ethereum.ts
@@ -54,7 +54,7 @@ export interface IOptimismDepositTransaction {
 	readonly sourceHash: bigint
 	readonly from: bigint
 	readonly to: bigint | null
-	readonly mint: bigint
+	readonly mint: bigint | null
 	readonly value: bigint
 	readonly gas: bigint
 	readonly data: Uint8Array