diff --git a/lib/config/options/index.ts b/lib/config/options/index.ts
index 6fd3ef2a76f26346496ef044a0179301f2f62efd..6daa3d5af4a99f8f4048ed38315578512721f31e 100644
--- a/lib/config/options/index.ts
+++ b/lib/config/options/index.ts
@@ -742,6 +742,7 @@ const options: RenovateOptions[] = [
     description:
       'Skip any package file whose path matches one of these. Can be a string or glob pattern.',
     type: 'array',
+    mergeable: false,
     subType: 'string',
     stage: 'repository',
     default: ['**/node_modules/**', '**/bower_components/**'],