diff --git a/lib/index.js b/lib/index.js
index 9c40ff60..a413d92e 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -93,7 +93,7 @@ function HttpProxyMiddleware(context, opts) {
 
         // store uri before it gets rewritten for logging
         var originalPath = req.url;
-        var newProxyOptions = _.cloneDeep(proxyOptions);
+        var newProxyOptions = _.assign({}, proxyOptions);
 
         // Apply in order:
         // 1. option.router