diff --git a/src/utils/utils.js b/src/utils/utils.js
index 4c9348634..4134f737f 100644
--- a/src/utils/utils.js
+++ b/src/utils/utils.js
@@ -92,7 +92,7 @@ function extend(...args) {
   for (let i = 1; i < args.length; i += 1) {
     const nextSource = args[i];
     if (nextSource !== undefined && nextSource !== null) {
-      const keysArray = Object.keys(Object(nextSource));
+      const keysArray = Object.keys(Object(nextSource)).filter((key) => key !== '__proto__');
       for (let nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex += 1) {
         const nextKey = keysArray[nextIndex];
         const desc = Object.getOwnPropertyDescriptor(nextSource, nextKey);