diff --git a/test/sequential/test-debugger-invalid-args.js b/test/sequential/test-debugger-invalid-args.js
index 36f8e588b04a6e..b137ed04255341 100644
--- a/test/sequential/test-debugger-invalid-args.js
+++ b/test/sequential/test-debugger-invalid-args.js
@@ -8,24 +8,20 @@ const startCLI = require('../common/debugger');
 const assert = require('assert');
 
 // Launch CLI w/o args.
-{
+(async () => {
   const cli = startCLI([]);
-  cli.quit()
-    .then((code) => {
-      assert.strictEqual(code, 1);
-      assert.match(cli.output, /^Usage:/, 'Prints usage info');
-    });
-}
+  const code = await cli.quit();
+  assert.strictEqual(code, 1);
+  assert.match(cli.output, /^Usage:/, 'Prints usage info');
+})().then(common.mustCall());
 
 // Launch w/ invalid host:port.
-{
+(async () => {
   const cli = startCLI([`localhost:${common.PORT}`]);
-  cli.quit()
-    .then((code) => {
-      assert.match(
-        cli.output,
-        /failed to connect/,
-        'Tells the user that the connection failed');
-      assert.strictEqual(code, 1);
-    });
-}
+  const code = await cli.quit();
+  assert.match(
+    cli.output,
+    /failed to connect/,
+    'Tells the user that the connection failed');
+  assert.strictEqual(code, 1);
+})().then(common.mustCall());