diff --git a/lib/workers/repository/init/config.js b/lib/workers/repository/init/config.js
index d86bab2450f3725642736185ca34ce817b683283..12123e7f5c44d9948e433cba0636f5a14a0e2aed 100644
--- a/lib/workers/repository/init/config.js
+++ b/lib/workers/repository/init/config.js
@@ -96,6 +96,11 @@ async function mergeRenovateConfig(config) {
       .join(', ');
     throw error;
   }
+  if (migratedConfig.warnings) {
+    returnConfig.warnings = returnConfig.warnings.concat(
+      migratedConfig.warnings
+    );
+  }
   delete migratedConfig.errors;
   delete migratedConfig.warnings;
   logger.debug({ config: migratedConfig }, 'renovate.json migrated config');