diff --git a/index.js b/index.js
index fcde1fd..904ec6b 100644
--- a/index.js
+++ b/index.js
@@ -26,7 +26,7 @@ function postHTMLParser(html, options) {
     };
 
     function parserDirective(name, data) {
-        var directives = objectAssign(defaultDirectives, options.directives);
+        var directives = [].concat(defaultDirectives, options.directives || []);
         var last = bufArray.last();
 
         for (var i = 0; i < directives.length; i++) {
diff --git a/package-lock.json b/package-lock.json
index d1658e5..8c6059e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "posthtml-parser",
-  "version": "0.3.2",
+  "version": "0.3.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 4980e83..253beb9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "posthtml-parser",
-  "version": "0.3.2",
+  "version": "0.3.3",
   "description": "Parse HTML/XML to PostHTMLTree",
   "keywords": [
     "html",