1 files changed, 3 insertions, 2 deletions
diff --git a/js/main.ts b/js/main.ts
index 818e6aa12..7c6fc7dc5 100644
--- a/js/main.ts
+++ b/js/main.ts
@@ -16,10 +16,11 @@ function assignCmdId(): number {
 
 function startMsg(cmdId: number): Uint8Array {
   const builder = new flatbuffers.Builder();
-  const msg = fbs.Start.createStart(builder, 0);
+  fbs.Start.startStart(builder);
+  const startOffset = fbs.Start.endStart(builder);
   fbs.Base.startBase(builder);
   fbs.Base.addCmdId(builder, cmdId);
-  fbs.Base.addMsg(builder, msg);
+  fbs.Base.addMsg(builder, startOffset);
   fbs.Base.addMsgType(builder, fbs.Any.Start);
   builder.finish(fbs.Base.endBase(builder));
   return builder.asUint8Array();