diff --git a/spec/ransack/helpers/form_helper_spec.rb b/spec/ransack/helpers/form_helper_spec.rb
index db88b838..43aee9e9 100644
--- a/spec/ransack/helpers/form_helper_spec.rb
+++ b/spec/ransack/helpers/form_helper_spec.rb
@@ -850,6 +850,11 @@ module Helpers
         before do
           Ransack.configure { |c| c.search_key = :example }
         end
+
+        after do
+          Ransack.configure { |c| c.search_key = nil }
+        end
+
         subject {
           @controller.view_context
           .search_form_for(Person.ransack) { |f| f.text_field :name_eq }