diff --git a/test/sequential/test-debugger-random-port-with-inspect-port.js b/test/sequential/test-debugger-random-port-with-inspect-port.js
index 5617e130f02585..b122f69c039381 100644
--- a/test/sequential/test-debugger-random-port-with-inspect-port.js
+++ b/test/sequential/test-debugger-random-port-with-inspect-port.js
@@ -9,22 +9,21 @@ const startCLI = require('../common/debugger');
 const assert = require('assert');
 
 // Random port with --inspect-port=0.
-{
-  const script = fixtures.path('debugger', 'three-lines.js');
+const script = fixtures.path('debugger', 'three-lines.js');
 
-  const cli = startCLI(['--inspect-port=0', script]);
+const cli = startCLI(['--inspect-port=0', script]);
 
-  cli.waitForInitialBreak()
-    .then(() => cli.waitForPrompt())
-    .then(() => {
-      assert.match(cli.output, /debug>/, 'prints a prompt');
-      assert.match(
-        cli.output,
-        /< Debugger listening on /,
-        'forwards child output');
-    })
-    .then(() => cli.quit())
-    .then((code) => {
-      assert.strictEqual(code, 0);
-    });
-}
+(async () => {
+  try {
+    await cli.waitForInitialBreak()
+    await cli.waitForPrompt()
+    assert.match(cli.output, /debug>/, 'prints a prompt');
+    assert.match(
+      cli.output,
+      /< Debugger listening on /,
+      'forwards child output');
+  } finally {
+    const code = cli.quit()
+    assert.strictEqual(code,0);
+  }
+})();