diff --git a/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/index.js b/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/index.js
index 842df9e094..f23100d34a 100644
--- a/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/index.js
+++ b/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/index.js
@@ -290,7 +290,7 @@
             return null;
         };
         
-        const originalSet = Map.prototype.set;
+        var originalSet = Map.prototype.set;
         Map.prototype.set = function (key, value) {
             if(typeof key === 'string'){
                 key = decodeURI(key);