diff --git a/addons/prop-types/lib/ReactPropTypesSecret.js b/addons/prop-types/lib/ReactPropTypesSecret.js
index 97d4bfb0c9f4c..15ca6a9461fc1 100644
--- a/addons/prop-types/lib/ReactPropTypesSecret.js
+++ b/addons/prop-types/lib/ReactPropTypesSecret.js
@@ -9,6 +9,6 @@
 
 'use strict';
 
-const ReactPropTypesSecret = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';
+var ReactPropTypesSecret = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';
 
 module.exports = ReactPropTypesSecret;