diff --git a/legacy/firmware/fsm.h b/legacy/firmware/fsm.h
index c20855be7d3..88c547a7250 100644
--- a/legacy/firmware/fsm.h
+++ b/legacy/firmware/fsm.h
@@ -103,6 +103,7 @@ void fsm_msgEthereumGetPublicKey(const EthereumGetPublicKey *msg);
 void fsm_msgEthereumSignTx(
     EthereumSignTx
         *msg);  // not const because we mutate transaction during validation
+void fsm_msgEthereumSignTxEIP1559(const EthereumSignTxEIP1559 *msg);
 void fsm_msgEthereumTxAck(const EthereumTxAck *msg);
 void fsm_msgEthereumSignMessage(const EthereumSignMessage *msg);
 void fsm_msgEthereumVerifyMessage(const EthereumVerifyMessage *msg);
diff --git a/legacy/firmware/fsm_msg_ethereum.h b/legacy/firmware/fsm_msg_ethereum.h
index aed40d45fdd..20115bb6847 100644
--- a/legacy/firmware/fsm_msg_ethereum.h
+++ b/legacy/firmware/fsm_msg_ethereum.h
@@ -76,6 +76,11 @@ void fsm_msgEthereumTxAck(const EthereumTxAck *msg) {
   ethereum_signing_txack(msg);
 }
 
+void fsm_msgEthereumSignTxEIP1559(const EthereumSignTxEIP1559 *msg) {
+  (void)msg;
+  fsm_sendFailure(FailureType_Failure_UnexpectedMessage, _("Not implemented"));
+}
+
 void fsm_msgEthereumGetAddress(const EthereumGetAddress *msg) {
   RESP_INIT(EthereumAddress);
 
diff --git a/legacy/firmware/protob/messages-ethereum.options b/legacy/firmware/protob/messages-ethereum.options
index 1e69e69ba3c..45bb6d775c3 100644
--- a/legacy/firmware/protob/messages-ethereum.options
+++ b/legacy/firmware/protob/messages-ethereum.options
@@ -6,6 +6,19 @@ EthereumSignTx.to                       max_size:43
 EthereumSignTx.value                    max_size:32
 EthereumSignTx.data_initial_chunk       max_size:1024
 
+EthereumSignTxEIP1559.address_n          max_count:8
+EthereumSignTxEIP1559.nonce              max_size:32
+EthereumSignTxEIP1559.max_gas_fee        max_size:32
+EthereumSignTxEIP1559.max_priority_fee   max_size:32
+EthereumSignTxEIP1559.gas_limit          max_size:32
+EthereumSignTxEIP1559.to                 max_size:32
+EthereumSignTxEIP1559.value              max_size:32
+EthereumSignTxEIP1559.data_initial_chunk max_size:1024
+EthereumSignTxEIP1559.access_list        max_count:8
+
+EthereumAccessList.address              max_size:32
+EthereumAccessList.storage_keys         max_count:8 max_size:32
+
 EthereumTxRequest.signature_r           max_size:32
 EthereumTxRequest.signature_s           max_size:32