diff --git a/lib/ruby_indexer/lib/ruby_indexer/index.rb b/lib/ruby_indexer/lib/ruby_indexer/index.rb
index aba69d098d..d858934abc 100644
--- a/lib/ruby_indexer/lib/ruby_indexer/index.rb
+++ b/lib/ruby_indexer/lib/ruby_indexer/index.rb
@@ -617,7 +617,7 @@ def existing_or_new_singleton_class(name)
     sig do
       type_parameters(:T).params(
         path: String,
-        type: T::Class[T.all(T.type_parameter(:T), Entry)],
+        type: T.nilable(T::Class[T.all(T.type_parameter(:T), Entry)]),
       ).returns(T::Array[T.type_parameter(:T)])
     end
     def entries_for(path, type = nil)