diff --git a/lib/bindings/http/commons.js b/lib/bindings/http/commons.js
index a12d3fc..33eb931 100644
--- a/lib/bindings/http/commons.js
+++ b/lib/bindings/http/commons.js
@@ -2,9 +2,11 @@ function sanityAndClone(headers) {
 
   var sanityHeaders = {};
 
-  for(header in headers){
-    sanityHeaders[header.toLowerCase()] = headers[header];
-  }
+  Array.from(Object.keys(headers))
+    .filter(header => Object.hasOwnProperty.call(headers, header))
+    .forEach(header => {
+      sanityHeaders[header.toLowerCase()] = headers[header];
+    });
 
   return sanityHeaders;
 }