diff --git a/lib/parser.js b/lib/parser.js
index db4e1f2..fc684bf 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -70,7 +70,7 @@ Parser.prototype = Emitter({
       errors: this.errors
     }));
 
-    this.ast.pushNode(this.bos);
+    this.ast.push(this.bos);
     this.nodes = [this.ast];
   },