diff --git a/lib/danger/danger_periphery.rb b/lib/danger/danger_periphery.rb
index 6e58920..6b0438b 100644
--- a/lib/danger/danger_periphery.rb
+++ b/lib/danger/danger_periphery.rb
@@ -102,7 +102,7 @@ def install(version: :latest, path: 'periphery', force: false)
     private
 
     def report(*args, **kwargs)
-      return fail(*args, **kwargs) if warning_as_error
+      return self.fail(*args, **kwargs) if warning_as_error
 
       warn(*args, **kwargs)
     end