diff --git a/src/index.js b/src/index.js
index 739d009..4a527b7 100644
--- a/src/index.js
+++ b/src/index.js
@@ -116,7 +116,7 @@ const iview = {
     Tree,
     Upload
 };
-const defaultOptions = {
+let defaultOptions = {
   componentPrefix: 'i'
 }
 const install = function (Vue, opts = {}) {
--
libgit2 0.21.4