diff --git a/build.js b/build.js
index fa9a31fb1b33..4e28061483ba 100644
--- a/build.js
+++ b/build.js
@@ -346,7 +346,7 @@ function rollupWarning(message) {
  */
 export async function bundleCombinedWorkers(options) {
   // Bundle non ES6 workers.
-  const workers = await globby(["Source/Workers/**"]);
+  const workers = await globby(["packages/engine/Source/Workers/**"]);
   const workerConfig = defaultESBuildOptions();
   workerConfig.bundle = false;
   workerConfig.banner = {
@@ -355,17 +355,20 @@ export async function bundleCombinedWorkers(options) {
   workerConfig.entryPoints = workers;
   workerConfig.outdir = options.path;
   workerConfig.minify = options.minify;
+  workerConfig.outbase = "packages/engine/Source";
   await esbuild.build(workerConfig);
 
   // Copy ThirdParty workers
-  const thirdPartyWorkers = await globby(["Source/ThirdParty/Workers/**"]);
+  const thirdPartyWorkers = await globby([
+    "packages/engine/Source/ThirdParty/Workers/**",
+  ]);
 
   const thirdPartyWorkerConfig = defaultESBuildOptions();
   thirdPartyWorkerConfig.bundle = false;
   thirdPartyWorkerConfig.entryPoints = thirdPartyWorkers;
   thirdPartyWorkerConfig.outdir = options.path;
   thirdPartyWorkerConfig.minify = options.minify;
-  thirdPartyWorkerConfig.outbase = "Source";
+  thirdPartyWorkerConfig.outbase = "packages/engine/Source";
   await esbuild.build(thirdPartyWorkerConfig);
 
   // Bundle ES6 workers.