diff --git a/packages/fineui/src/fix/fix.js b/packages/fineui/src/fix/fix.js
index 1cd977916..92cba70f8 100644
--- a/packages/fineui/src/fix/fix.js
+++ b/packages/fineui/src/fix/fix.js
@@ -635,7 +635,7 @@ const Observer = (function() {
 
 function protoAugment(target, src, keys) {
     /* eslint-disable no-proto */
-    target.__proto__ = src;
+    Object.setPrototypeOf(target, src);
     /* eslint-enable no-proto */
 }