diff --git a/package.json b/package.json
index 71312e0..48d672c 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "build": "cp mustache.js mustache.mjs && rollup mustache.mjs --file mustache.js --format umd --name Mustache && uglifyjs mustache.js > mustache.min.js",
     "test": "npm run test-lint && npm run test-unit",
     "test-lint": "eslint mustache.js bin/mustache test/**/*.js",
-    "test-unit": "mocha --reporter spec --require esm test/*-test.js",
+    "test-unit": "mocha --reporter spec test/*-test.js",
     "test-render": "mocha  --reporter spec test/render-test",
     "pre-test-browser": "node test/create-browser-suite.js",
     "test-browser": "npm run pre-test-browser && zuul -- test/context-test.js test/parse-test.js test/scanner-test.js test/render-test-browser.js",
diff --git a/test/cli-test.js b/test/cli-test.js
index 6f7d2f8..cfaabdd 100644
--- a/test/cli-test.js
+++ b/test/cli-test.js
@@ -9,7 +9,8 @@ var cliPartialsTxt = path.resolve(_files, 'cli_with_partials.txt');
 var moduleVersion = require('../package').version;
 
 function changeForOS (command) {
-  command = command.replace('bin/mustache', 'node --require esm bin/mustache')
+  var requireFlag = !isLegacyNodeVersion ? '--require esm' : '';
+  command = command.replace('bin/mustache', 'node ' + requireFlag + ' bin/mustache')
 
   if (process.platform === 'win32') {
     return command
diff --git a/test/helper.js b/test/helper.js
index 2988766..f89a5f6 100644
--- a/test/helper.js
+++ b/test/helper.js
@@ -1,4 +1,12 @@
 var chai = require('chai');
+var nodejsMajorVersion = Number(process.versions.node.split(".")[0]);
+
+isLegacyNodeVersion = !(nodejsMajorVersion >= 10);
+
+if (!isLegacyNodeVersion) {
+  require = require("esm")(module);
+}
+
 assert = chai.assert;
 chai.should();
 Mustache = require('../mustache');