diff --git a/lib/rack/attack/cache.rb b/lib/rack/attack/cache.rb
index cb3a0db8..bcf7bf97 100644
--- a/lib/rack/attack/cache.rb
+++ b/lib/rack/attack/cache.rb
@@ -9,8 +9,6 @@ class Cache
       def self.default_store
         if Object.const_defined?(:Rails) && Rails.singleton_class.method_defined?(:cache)
           ::Rails.cache
-        else
-          ActiveSupport::Cache::MemoryStore.new
         end
       end