diff --git a/ethers/signer.nim b/ethers/signer.nim
index 84d1c45..9f953e0 100644
--- a/ethers/signer.nim
+++ b/ethers/signer.nim
@@ -147,6 +147,7 @@ method populateTransaction*(
     trace "EIP-1559 is supported", maxPriorityFeePerGas = maxPriorityFeePerGas, maxFeePerGas = maxFeePerGas
   else:
     populated.gasPrice = some(transaction.gasPrice |? (await signer.getGasPrice()))
+    populated.maxFeePerGas = none(UInt256)
     trace "EIP-1559 is not supported", gasPrice = populated.gasPrice
 
   if transaction.nonce.isNone and transaction.gasLimit.isNone: