diff --git a/packages/webpack-uni-pages-loader/lib/platforms/app-plus/define-pages.js b/packages/webpack-uni-pages-loader/lib/platforms/app-plus/define-pages.js
index 44362c10b1efda883768bd896fdd0c4ce405969b..1e4694522ef7c5767898a544a1664eba7c6b22b8 100644
--- a/packages/webpack-uni-pages-loader/lib/platforms/app-plus/define-pages.js
+++ b/packages/webpack-uni-pages-loader/lib/platforms/app-plus/define-pages.js
@@ -11,7 +11,7 @@ module.exports = function definePages (appJson) {
   return {
     name: 'define-pages.js',
     content: `
-if (!Promise.prototype.finally) {
+if (typeof Promise !== 'undefined' && !Promise.prototype.finally) {
   Promise.prototype.finally = function(callback) {
     const promise = this.constructor
     return this.then(