diff --git a/lib/main.js b/lib/main.js
index 748dbfcb..73695413 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -64,7 +64,7 @@ Lambda.prototype.run = function (program) {
   const event = require(path.join(process.cwd(), program.eventFile))
   const context = require(path.join(process.cwd(), program.contextFile))
 
-  if (Object.prototype.toString.call(event) !== '[object Array]') {
+  if (!Array.isArray(event)) {
     return this._runHandler(handler, event, program, context)
   }
   this._runMultipleHandlers(event)
@@ -213,7 +213,7 @@ Lambda.prototype._eventSourceList = function (program) {
     }
   })()
 
-  if (Object.prototype.toString.call(list) === '[object Array]') {
+  if (Array.isArray(list)) {
     // backward-compatible
     return {
       EventSourceMappings: list,