diff --git a/fxjs/xfa/cjx_extras.h b/fxjs/xfa/cjx_extras.h
index e6e2dc1..420bfe4 100644
--- a/fxjs/xfa/cjx_extras.h
+++ b/fxjs/xfa/cjx_extras.h
@@ -18,6 +18,9 @@
   ~CJX_Extras() override;
 
   JSE_PROP(type);
+
+ private:
+  using Type__ = CJX_Extras;
 };
 
 #endif  // FXJS_XFA_CJX_EXTRAS_H_