diff --git a/grpc/execution/server.go b/grpc/execution/server.go
index 971a4d613..a22653a2b 100644
--- a/grpc/execution/server.go
+++ b/grpc/execution/server.go
@@ -277,7 +277,7 @@ func (s *ExecutionServiceServerV1) ExecuteBlock(ctx context.Context, req *astria
 	// Build a payload to add to the chain
 	payloadAttributes := &miner.BuildPayloadArgs{
 		Parent:       prevHeadHash,
-		Timestamp:    uint64(req.GetTimestamp().GetSeconds()),
+		Timestamp:    uint64(req.GetTimestamp().AsTime().UnixNano()),
 		Random:       common.Hash{},
 		FeeRecipient: s.nextFeeRecipient,
 	}