diff --git a/lib/ruby_indexer/lib/ruby_indexer/reference_finder.rb b/lib/ruby_indexer/lib/ruby_indexer/reference_finder.rb
index 1051206e8..956b166b2 100644
--- a/lib/ruby_indexer/lib/ruby_indexer/reference_finder.rb
+++ b/lib/ruby_indexer/lib/ruby_indexer/reference_finder.rb
@@ -6,6 +6,9 @@ class ReferenceFinder
     extend T::Sig
 
     class Target
+      extend T::Helpers
+
+      abstract!
     end
 
     class ConstTarget < Target