diff --git a/nimbus/transaction.nim b/nimbus/transaction.nim
index 879a8e50b..d17398a84 100644
--- a/nimbus/transaction.nim
+++ b/nimbus/transaction.nim
@@ -45,7 +45,7 @@ proc toSignature*(transaction: Transaction): Signature =
   bytes[0..31] = transaction.R.toByteArrayBE()
   bytes[32..63] = transaction.S.toByteArrayBE()
   # TODO: V will become a byte or range soon.
-  bytes[64] = cast[uint64](transaction.V.data.lo).uint8
+  bytes[64] = transaction.V
   initSignature(bytes)
 
 proc getSender*(transaction: Transaction, output: var EthAddress): bool =