diff --git a/lib/internal/test_runner/harness.js b/lib/internal/test_runner/harness.js
index 150d11733ad4e8..9109495fef03f3 100644
--- a/lib/internal/test_runner/harness.js
+++ b/lib/internal/test_runner/harness.js
@@ -259,11 +259,8 @@ function lazyBootstrapRoot() {
       entryFile,
       loc: entryFile ? [1, 1, entryFile] : undefined,
     };
-    const globalOptions = {
-      __proto__: null,
-      ...parseCommandLine(),
-      cwd: process.cwd(),
-    };
+    const globalOptions = parseCommandLine();
+    globalOptions.cwd = process.cwd();
     createTestTree(rootTestOptions, globalOptions);
     globalRoot.reporter.on('test:summary', (data) => {
       if (!data.success) {