diff --git a/lib/rbs/errors.rb b/lib/rbs/errors.rb
index 81739af14..dbffbab6b 100644
--- a/lib/rbs/errors.rb
+++ b/lib/rbs/errors.rb
@@ -40,6 +40,9 @@ class RecursiveAncestorError < StandardError
     attr_reader :location
 
     def initialize(ancestors:, location:)
+      @ancestors = ancestors
+      @location = location
+
       names = ancestors.map do |ancestor|
         case ancestor
         when Definition::Ancestor::Singleton