diff --git a/op-program/client/l2/engineapi/block_processor.go b/op-program/client/l2/engineapi/block_processor.go
index cc8188f93afd..1e9765588413 100644
--- a/op-program/client/l2/engineapi/block_processor.go
+++ b/op-program/client/l2/engineapi/block_processor.go
@@ -50,7 +50,7 @@ func NewBlockProcessorFromPayloadAttributes(provider BlockDataProvider, parent c
 		MixDigest:        common.Hash(attrs.PrevRandao),
 		Nonce:            types.EncodeNonce(0),
 		ParentBeaconRoot: attrs.ParentBeaconBlockRoot,
-		Millisecond:      uint64(attrs.Milliseconds),
+		Milliseconds:     uint64(attrs.Milliseconds),
 	}
 
 	// Ecotone