diff --git a/lib/main.js b/lib/main.js
index 4bbacb9d..03866b0c 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -45,28 +45,33 @@ Lambda.prototype.setup = function (program) {
 }
 
 Lambda.prototype.run = function (program) {
+  if (['nodejs4.3', 'nodejs6.10'].indexOf(program.runtime) === -1) {
+    console.error(`Runtime [${program.runtime}] is not supported.`)
+    process.exit(254)
+  }
+
   this._createSampleFile(program.eventFile, 'event.json')
-  var splitHandler = program.handler.split('.')
-  var filename = splitHandler[0] + '.js'
-  var handlername = splitHandler[1]
+  const splitHandler = program.handler.split('.')
+  const filename = splitHandler[0] + '.js'
+  const handlername = splitHandler[1]
 
   // Set custom environment variables if program.configFile is defined
   if (program.configFile) {
     this._setRunTimeEnvironmentVars(program)
   }
 
-  var handler = require(path.join(process.cwd(), filename))[handlername]
-  var event = require(path.join(process.cwd(), program.eventFile))
-  var context = require(path.join(process.cwd(), program.contextFile))
+  const handler = require(path.join(process.cwd(), filename))[handlername]
+  const event = require(path.join(process.cwd(), program.eventFile))
+  const context = require(path.join(process.cwd(), program.contextFile))
 
   this._runHandler(handler, event, program, context)
 }
 
-Lambda.prototype._runHandler = function (handler, event, program, context) {
-  var startTime = new Date()
-  var timeout = Math.min(program.timeout, 300) * 1000 // convert the timeout into milliseconds
+Lambda.prototype._runHandler = (handler, event, program, context) => {
+  const startTime = new Date()
+  const timeout = Math.min(program.timeout, 300) * 1000 // convert the timeout into milliseconds
 
-  var callback = function (err, result) {
+  const callback = (err, result) => {
     if (err) {
       process.exitCode = 255
       console.log('Error: ' + err)
@@ -82,15 +87,11 @@ Lambda.prototype._runHandler = function (handler, event, program, context) {
     }
   }
 
-  context.getRemainingTimeInMillis = function () {
-    var currentTime = new Date()
+  context.getRemainingTimeInMillis = () => {
+    const currentTime = new Date()
     return timeout - (currentTime - startTime)
   }
 
-  if (['nodejs4.3', 'nodejs6.10'].indexOf(program.runtime) === -1) {
-    console.error(`Runtime [${program.runtime}] is not supported.`)
-    process.exit(254)
-  }
   handler(event, context, callback)
 }
 
diff --git a/test/node-lambda.js b/test/node-lambda.js
index 1800b407..0f3eafba 100644
--- a/test/node-lambda.js
+++ b/test/node-lambda.js
@@ -18,12 +18,21 @@ describe('bin/node-lambda', () => {
         '--eventFile', 'event.json'
       ])
       var stdoutString = ''
+      var stderrString = ''
       run.stdout.on('data', (data) => {
         stdoutString += data.toString().replace(/\r|\n/g, '')
       })
+      run.stderr.on('data', (data) => {
+        stderrString += data.toString().replace(/\r|\n/g, '')
+      })
 
       run.on('exit', (code) => {
-        assert.match(stdoutString, expectedValues.stdoutRegExp)
+        if (expectedValues.stdoutRegExp) {
+          assert.match(stdoutString, expectedValues.stdoutRegExp)
+        }
+        if (expectedValues.stderrRegExp) {
+          assert.match(stderrString, expectedValues.stderrRegExp)
+        }
         assert.equal(code, expectedValues.exitCode)
         done()
       })
@@ -136,5 +145,29 @@ describe('bin/node-lambda', () => {
         })
       })
     })
+
+    describe('node-lambda run (Runtime is not supported)', () => {
+      const eventObj = {
+        asyncTest: false,
+        callbackWaitsForEmptyEventLoop: true // True is the default value of Lambda
+      }
+
+      before(() => {
+        process.env.AWS_RUNTIME = 'test'
+      })
+      after(() => {
+        process.env.AWS_RUNTIME = 'nodejs6.10'
+      })
+
+      it('`node-lambda run` exitCode is `254` (callback(null))', (done) => {
+        _generateEventFile(Object.assign(eventObj, {
+          callbackCode: 'callback(null);'
+        }))
+        _testMain({
+          stderrRegExp: /^Runtime \[test\] is not supported\.$/,
+          exitCode: 254
+        }, done)
+      })
+    })
   })
 })