diff --git a/lib/config/definitions.js b/lib/config/definitions.js
index ac701c84ded079840886dcfd0986856095b8eff8..6bfa867981608b6dd8b7469e9a681c4514d02e41 100644
--- a/lib/config/definitions.js
+++ b/lib/config/definitions.js
@@ -237,6 +237,7 @@ const options = [
       'Apply config on a path-based basis. Consists of a paths array plus whatever other configuration objects to apply',
     type: 'list',
     stage: 'repository',
+    mergeable: true,
     cli: false,
     env: false,
   },