diff --git a/index.js b/index.js
index 430d1c43..b703a9a3 100644
--- a/index.js
+++ b/index.js
@@ -1,7 +1,7 @@
 "use strict";
 const esprima = require('esprima');
+const escodegen = require('escodegen');
 const Obfuscator_1 = require('./src/Obfuscator');
-let escodegen = require('escodegen');
 class JavaScriptObfuscator {
     static obfuscate(sourceCode, options = {}) {
         let astTree = esprima.parse(sourceCode), obfuscator = new Obfuscator_1.Obfuscator(options);
diff --git a/index.ts b/index.ts
index cdf4ba96..08e916d5 100644
--- a/index.ts
+++ b/index.ts
@@ -1,11 +1,10 @@
 "use strict";
 
 import * as esprima from 'esprima';
+import * as escodegen from 'escodegen';
 
 import { Obfuscator } from './src/Obfuscator';
 
-let escodegen = require('escodegen');
-
 export class JavaScriptObfuscator {
     /**
      * @type any
diff --git a/typings/custom/escodegen/escodegen.d.ts b/typings/custom/escodegen/escodegen.d.ts
index 42c8027b..5b849567 100644
--- a/typings/custom/escodegen/escodegen.d.ts
+++ b/typings/custom/escodegen/escodegen.d.ts
@@ -1,4 +1,4 @@
-declare module 'escodegen' {
+declare namespace escodegen {
     interface GenerateOpts {
         comment?: boolean;
         format?: {
@@ -10,5 +10,9 @@ declare module 'escodegen' {
         }
     }
 
-    export function generate(ast: any, opts?: GenerateOpts): string;
+    function generate(ast: any, opts?: GenerateOpts): string;
+}
+
+declare module "escodegen" {
+    export = escodegen
 }
\ No newline at end of file