diff --git a/execution/execution.proto b/execution/execution.proto
index d86b95f..3ba8c01 100644
--- a/execution/execution.proto
+++ b/execution/execution.proto
@@ -116,7 +116,7 @@ message ValidationRequest {
 message AssembleBlockRequest {
     types.H256 parent_hash = 1;
     uint64 timestamp = 2;
-    types.H256 mix_digest = 3;
+    types.H256 prev_randao = 3;
     types.H160 suggested_fee_recipient = 4;
     repeated types.Withdrawal withdrawals = 5;        // added in Shanghai (EIP-4895)
     optional types.H256 parent_beacon_block_root = 6; // added in Cancun (EIP-4788)