diff --git a/babel.config.js b/babel.config.js
index cfdeb9f05..40f6e3f80 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -1,5 +1,6 @@
 const babelConfig = require('@nextcloud/babel-config')
 
 babelConfig.plugins.push('@babel/plugin-proposal-class-properties')
+babelConfig.plugins.push('@babel/plugin-transform-private-methods')
 
 module.exports = babelConfig
diff --git a/package-lock.json b/package-lock.json
index 05e382bea..54849cf19 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -36,6 +36,7 @@
       },
       "devDependencies": {
         "@babel/plugin-proposal-class-properties": "^7.18.6",
+        "@babel/plugin-transform-private-methods": "^7.25.4",
         "@nextcloud/babel-config": "^1.2.0",
         "@nextcloud/browserslist-config": "^3.0.1",
         "@nextcloud/cypress": "^1.0.0-beta.7",
@@ -1589,7 +1590,6 @@
       "integrity": "sha512-ao8BG7E2b/URaUQGqN3Tlsg+M3KlHY6rJ1O1gXAEUnZoyNQnvKyH87Kfg+FoxSeyWUB8ISZZsC91C44ZuBFytw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/helper-create-class-features-plugin": "^7.25.4",
         "@babel/helper-plugin-utils": "^7.24.8"
diff --git a/package.json b/package.json
index c72e85cf9..0eda264ed 100644
--- a/package.json
+++ b/package.json
@@ -75,6 +75,7 @@
   },
   "devDependencies": {
     "@babel/plugin-proposal-class-properties": "^7.18.6",
+    "@babel/plugin-transform-private-methods": "^7.25.4",
     "@nextcloud/babel-config": "^1.2.0",
     "@nextcloud/browserslist-config": "^3.0.1",
     "@nextcloud/cypress": "^1.0.0-beta.7",