diff --git a/packages/@vue/cli-plugin-typescript/index.js b/packages/@vue/cli-plugin-typescript/index.js
index 8d65a125d..264956463 100644
--- a/packages/@vue/cli-plugin-typescript/index.js
+++ b/packages/@vue/cli-plugin-typescript/index.js
@@ -15,8 +15,7 @@ module.exports = (api, options) => {
 
     config.resolve
       .extensions
-        .prepend('.ts')
-        .prepend('.tsx')
+        .merge(['.ts', '.tsx'])
 
     const tsRule = config.module.rule('ts').test(/\.ts$/)
     const tsxRule = config.module.rule('tsx').test(/\.tsx$/)