diff --git a/packages/trace-viewer/vite.config.ts b/packages/trace-viewer/vite.config.ts
index 0807316fc5..92080fe003 100644
--- a/packages/trace-viewer/vite.config.ts
+++ b/packages/trace-viewer/vite.config.ts
@@ -35,7 +35,8 @@ export default defineConfig({
   },
   build: {
     outDir: path.resolve(__dirname, '../playwright-core/lib/webpack/traceViewer'),
-    emptyOutDir: true,
+    // Output dir is shared with vite.sw.config.ts, clearing it here is racy.
+    emptyOutDir: false,
     rollupOptions: {
       output: {
         entryFileNames: () => '[name].[hash].js',
diff --git a/packages/trace-viewer/vite.sw.config.ts b/packages/trace-viewer/vite.sw.config.ts
index 8b23d6aac8..9929f5d205 100644
--- a/packages/trace-viewer/vite.sw.config.ts
+++ b/packages/trace-viewer/vite.sw.config.ts
@@ -35,6 +35,8 @@ export default defineConfig({
   },
   build: {
     outDir: path.resolve(__dirname, '../playwright-core/lib/webpack/traceViewer'),
+    // Output dir is shared with vite.config.ts, clearing it here is racy.
+    emptyOutDir: false,
     rollupOptions: {
       input: {
         sw: path.resolve(__dirname, 'src/sw.ts'),