diff --git a/src/systems/filecoin_blockchain/struct/block/block.id b/src/systems/filecoin_blockchain/struct/block/block.id
index c32a1efd4..384eef274 100644
--- a/src/systems/filecoin_blockchain/struct/block/block.id
+++ b/src/systems/filecoin_blockchain/struct/block/block.id
@@ -37,6 +37,8 @@ type BlockHeader struct {
     // Signatures
     Signature              filcrypto.Signature
 
+    BaseFee                abi.TokenAmount
+
     //	SerializeSigned()            []byte
     //	ComputeUnsignedFingerprint() []
 }
diff --git a/src/systems/filecoin_vm/message/message.id b/src/systems/filecoin_vm/message/message.id
index 8dd2db495..0ac0a526a 100644
--- a/src/systems/filecoin_vm/message/message.id
+++ b/src/systems/filecoin_vm/message/message.id
@@ -29,9 +29,12 @@ type UnsignedMessage struct {
     // Amount of value to transfer from sender's to receiver's balance.
     Value       abi.TokenAmount
 
-    // GasPrice is a Gas-to-FIL cost
-    GasPrice    abi.TokenAmount
+    // Maximum amount of Gas used
     GasLimit    GasAmount
+    // Maximum price to be paid per unit of Gas, includes GasPremium
+    GasFeeCap   abi.TokenAmount
+    // How much to pay miner per unit of Gas
+    GasPremium  abi.TokenAmount
 
     // Optional method to invoke on receiver, zero for a plain value send.
     Method      abi.MethodNum