diff --git a/lib/class_builder.js b/lib/class_builder.js
index 127ad2a..3a0d93e 100644
--- a/lib/class_builder.js
+++ b/lib/class_builder.js
@@ -72,7 +72,11 @@ var util           = require( __dirname + '/util' ),
      *
      * @type {Object.<string,boolean}
      */
-    public_methods = { '__construct': true }
+    public_methods = {
+        '__construct': true,
+        'toString':    true,
+        '__toString':  true,
+    }
 ;