diff --git a/native_mate/dictionary.h b/native_mate/dictionary.h
index 0ff05c9bb88a..c15f8f902fdd 100644
--- a/native_mate/dictionary.h
+++ b/native_mate/dictionary.h
@@ -36,12 +36,25 @@ class Dictionary {
     return ConvertFromV8(isolate_, val, out);
   }
 
+  template<typename T>
+  bool GetHidden(const base::StringPiece& key, T* out) const {
+    v8::Local<v8::Value> val = GetHandle()->GetHiddenValue(
+        StringToV8(isolate_, key));
+    return ConvertFromV8(isolate_, val, out);
+  }
+
   template<typename T>
   bool Set(const base::StringPiece& key, T val) {
     return GetHandle()->Set(StringToV8(isolate_, key),
                             ConvertToV8(isolate_, val));
   }
 
+  template<typename T>
+  bool SetHidden(const base::StringPiece& key, T val) {
+    return GetHandle()->SetHiddenValue(StringToV8(isolate_, key),
+                                       ConvertToV8(isolate_, val));
+  }
+
   template<typename T>
   bool SetMethod(const base::StringPiece& key, const T& callback) {
     return GetHandle()->Set(