diff --git a/README.MD b/README.MD
index 0d88dda..3cf06de 100644
--- a/README.MD
+++ b/README.MD
@@ -56,5 +56,16 @@ export interface IRenameExtensionsOptions {
      * Extensions should include the dot for both input and output.
      */
     map: (name: string) => string;
+
+
+    /**
+     * An acorn.Options object.
+     * This option will extend the default:
+     * `{ ecmaVersion: 6, sourceType: 'module' }`
+     * Provide it if you do not transpile any es7+ features
+     * @see https://github.com/acornjs/acorn/blob/master/acorn/src/options.js
+     * @see https://github.com/acornjs/acorn/blob/9899904395d67776a78702fe5640ea4bc12b9ec6/acorn/dist/acorn.d.ts#L14
+     */
+    parserOptions?: acorn.Options;
 }
 ```
diff --git a/package-lock.json b/package-lock.json
index 957aaa2..a558e83 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "rollup-plugin-rename",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -21,15 +21,24 @@
         }
       }
     },
+    "@types/acorn": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/@types/acorn/-/acorn-4.0.6.tgz",
+      "integrity": "sha512-veQTnWP+1D/xbxVrPC3zHnCZRjSrKfhbMUlEA43iMZLu7EsnTtkJklIuwrCPbOi8YkvDQAiW05VQQFvvz9oieQ==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "*"
+      }
+    },
     "@types/estree": {
       "version": "0.0.39",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
       "integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw=="
     },
-    "acorn-walk": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
-      "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA=="
+    "estree-walker": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-2.0.2.tgz",
+      "integrity": "sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w=="
     },
     "fsevents": {
       "version": "2.1.3",
diff --git a/package.json b/package.json
index 8b19592..7ddf6a9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rollup-plugin-rename",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Plugin to rename file name before they're emitted in rollup",
   "main": "dist/index.js",
   "homepage": "https://github.com/yesmeck/rollup-plugin-rename",
@@ -24,6 +24,7 @@
     "magic-string": "^0.25.7"
   },
   "devDependencies": {
+    "@types/acorn": "^4.0.6",
     "rollup": "^2.23.0",
     "typescript": "^3.9.7"
   }
diff --git a/src/index.ts b/src/index.ts
index 970fdbd..78d2d31 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,6 +4,7 @@ import { Node } from 'estree';
 import { walk } from 'estree-walker';
 import MagicString from 'magic-string';
 
+
 enum NodeType {
   Literal = 'Literal',
   CallExpression = 'CallExpression',
@@ -35,12 +36,38 @@ export interface IRenameExtensionsOptions {
    * Extensions should include the dot for both input and output.
    */
   map: (name: string) => string;
+
+  /**
+   * An acorn.Options object.
+   * This option will extend the default:
+   * `{ ecmaVersion: 6, sourceType: 'module' }`
+   * Provide it if you do not transpile any es7+ features
+   * @see https://github.com/acornjs/acorn/blob/master/acorn/src/options.js
+   * @see https://github.com/acornjs/acorn/blob/9899904395d67776a78702fe5640ea4bc12b9ec6/acorn/dist/acorn.d.ts#L14
+   */
+  parserOptions?: acorn.Options;
 }
 
 export function isEmpty(array: any[] | undefined) {
   return !array || array.length === 0;
 }
 
+const defaultParserOptions: acorn.Options = {
+  ecmaVersion: 6,
+  sourceType: 'module',
+};
+
+export function getParserOptions(options?: acorn.Options): acorn.Options {
+  if (!options) {
+    return defaultParserOptions;
+  }
+
+  return {
+    ...defaultParserOptions,
+    ...options
+  };
+}
+
 export function getRequireSource(node: any): Node | false {
   if (node.type !== NodeType.CallExpression) {
     return false;
@@ -106,10 +133,7 @@ export default function rename(options: IRenameExtensionsOptions): Plugin {
 
         if (file.code) {
           const magicString = new MagicString(file.code);
-          const ast = this.parse(file.code, {
-            ecmaVersion: 6,
-            sourceType: 'module',
-          });
+          const ast = this.parse(file.code, getParserOptions(options.parserOptions));
 
           walk(ast, {
             enter(node) {
diff --git a/tsconfig.json b/tsconfig.json
index 9d72a3c..a509893 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,4 +12,7 @@
   },
   "include": ["./src"],
   "exclude": ["node_modules", "dist"],
+  "types": [
+    "acorn",
+  ],
 }