diff --git a/uniCloud/cloudfunctions/common/uni-im-ext/index.js b/uniCloud/cloudfunctions/common/uni-im-ext/index.js
index aa4fd3973a57c814543f67641ed982fe794b953d..c113d16a50ea26cca30fa8ca31a95934940bdd46 100644
--- a/uniCloud/cloudfunctions/common/uni-im-ext/index.js
+++ b/uniCloud/cloudfunctions/common/uni-im-ext/index.js
@@ -200,7 +200,7 @@ let _registeredExtensionPointsPromise
  * @returns {any[]} 该扩展点上挂接的所有扩展程序各自的返回值拼装在一个数组里。
  */
 async function invokeExts(extensionPointName, ...args) {
-  isFsWritable = (this.getCloudInfo().provider === 'aliyun')
+  isFsWritable = (uniCloud.getCloudInfos().provider === 'aliyun')
 
   // 尝试从生成的缓存文件中加载
   let registeredExtensionPoints