diff --git a/lib/axios.js b/lib/axios.js
index 2d1fde2cd9..4e6224231e 100644
--- a/lib/axios.js
+++ b/lib/axios.js
@@ -30,7 +30,7 @@ function createInstance(defaultConfig) {
   utils.extend(instance, Axios.prototype, context, {allOwnKeys: true});
 
   // Copy context to instance
-  utils.extend(instance, context, {allOwnKeys: true});
+  utils.extend(instance, context, null, {allOwnKeys: true});
 
   // Factory for creating new instances
   instance.create = function create(instanceConfig) {