diff --git a/bin/qunit.js b/bin/qunit.js
index 500594fcb..e44f8b19f 100755
--- a/bin/qunit.js
+++ b/bin/qunit.js
@@ -10,7 +10,7 @@ const pkg = require('../package.json');
 const description = `Runs tests using the QUnit framework.
 
   Files should be a space-separated list of files, directories, or glob expressions.
-  Defaults to 'test/**/*.js'.
+  Defaults to 'test/**/*.{js,mjs,cjs}'.
 
   For more info on working with QUnit, check out https://qunitjs.com.`;
 
diff --git a/src/cli/utils.js b/src/cli/utils.js
index 621228dd5..31465ed84 100644
--- a/src/cli/utils.js
+++ b/src/cli/utils.js
@@ -29,8 +29,7 @@ function getFilesFromArgs (args) {
 
   // Default to files in the test directory
   if (!patterns.length) {
-    // TODO: In QUnit 3.0, change the default to {js,mjs}
-    patterns.push('test/**/*.js');
+    patterns.push('test/**/*.{js,mjs,cjs}');
   }
 
   const files = new Set();
@@ -47,8 +46,7 @@ function getFilesFromArgs (args) {
       files.add(pattern);
     } else {
       if (stat && stat.isDirectory()) {
-        // TODO: In QUnit 3.0, change the default to {js,mjs}
-        pattern = `${pattern}/**/*.js`;
+        pattern = `${pattern}/**/*.{js,mjs,cjs}`;
       }
       const results = glob(pattern, {
         cwd: process.cwd(),