diff --git a/CHANGELOG b/CHANGELOG
index 9e31041880..3551ef0e54 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Allow sao classes to use javascript properties
 * Improve layout of CSV import/export
 * Add support for height and width on notebook
 * Use tab key for tab navigation
diff --git a/src/sao.js b/src/sao.js
index 3756ccc522..94f7e29072 100644
--- a/src/sao.js
+++ b/src/sao.js
@@ -125,7 +125,8 @@ var Sao = {};
         ClassConstructor._super = Parent.prototype;
         if (props) {
             for (var name in props) {
-                ClassConstructor.prototype[name] = props[name];
+                Object.defineProperty(ClassConstructor.prototype, name,
+                    Object.getOwnPropertyDescriptor(props, name));
             }
         }
         return ClassConstructor;