diff --git a/lib/transport.js b/lib/transport.js
index 00ff53231..efac1ab7c 100644
--- a/lib/transport.js
+++ b/lib/transport.js
@@ -29,12 +29,11 @@ function setupOnExit (stream) {
   }
 }
 
-function buildStream (filename, workerData, workerOpts) {
+function buildStream (filename, workerData, workerOpts, streamOpts = {}) {
   const stream = new ThreadStream({
     filename,
     workerData,
-    workerOpts,
-    sync: true // TODO should this be configurable?
+    workerOpts
   })
 
   stream.on('ready', function () {