diff --git a/lib/layer.js b/lib/layer.js
index 6a4408f..73a2332 100644
--- a/lib/layer.js
+++ b/lib/layer.js
@@ -65,7 +65,8 @@ function Layer (path, options, fn) {
           return false
         }
 
-        const params = {}
+        const params = { __proto__: null }
+
         for (let i = 1; i < match.length; i++) {
           const key = keys[i - 1]
           const prop = key.name