diff --git a/lib/internal/test_runner/harness.js b/lib/internal/test_runner/harness.js
index be57f92268355c..95715769a3632f 100644
--- a/lib/internal/test_runner/harness.js
+++ b/lib/internal/test_runner/harness.js
@@ -136,7 +136,7 @@ function setup(root) {
     createProcessEventHandler('unhandledRejection', root);
   const coverage = configureCoverage(root, globalOptions);
   const exitHandler = () => {
-    root.coverage = collectCoverage(root, coverage);
+    root.harness.coverage = collectCoverage(root, coverage);
     root.postRun(new ERR_TEST_FAILURE(
       'Promise resolution is still pending but the event loop has already resolved',
       kCancelledByParent));
@@ -160,6 +160,11 @@ function setup(root) {
     process.on('SIGTERM', terminationHandler);
   }
 
+  root.harness = {
+    __proto__: null,
+    bootstrapComplete: false,
+    coverage: null,
+  };
   root.startTime = hrtime();
 
   wasRootSetup.add(root);
diff --git a/lib/internal/test_runner/test.js b/lib/internal/test_runner/test.js
index 77516a93c00df8..f6a71002803699 100644
--- a/lib/internal/test_runner/test.js
+++ b/lib/internal/test_runner/test.js
@@ -252,7 +252,7 @@ class Test extends AsyncResource {
     this.#outerSignal?.addEventListener('abort', this.#abortHandler);
 
     this.fn = fn;
-    this.coverage = null; // Configured on the root test by the test harness.
+    this.harness = null; // Configured on the root test by the test harness.
     this.mock = null;
     this.name = name;
     this.parent = parent;
@@ -651,8 +651,8 @@ class Test extends AsyncResource {
       this.reporter.diagnostic(this.nesting, kFilename, `todo ${counters.todo}`);
       this.reporter.diagnostic(this.nesting, kFilename, `duration_ms ${this.#duration()}`);
 
-      if (this.coverage) {
-        this.reporter.coverage(this.nesting, kFilename, this.coverage);
+      if (this.harness?.coverage) {
+        this.reporter.coverage(this.nesting, kFilename, this.harness.coverage);
       }
 
       this.reporter.push(null);