diff --git a/lib/sidekiq/web.rb b/lib/sidekiq/web.rb
index ab63fd08..ef528dcd 100644
--- a/lib/sidekiq/web.rb
+++ b/lib/sidekiq/web.rb
@@ -80,7 +80,7 @@ module Sidekiq
     end
 
     def middlewares
-      @middlewares ||= Web.middlewares
+      @middlewares ||= Web.middlewares.dup
     end
 
     def call(env)