diff --git a/config/initializers/sidekiq.rb b/config/initializers/sidekiq.rb
index 61e131336..0ee77730e 100644
--- a/config/initializers/sidekiq.rb
+++ b/config/initializers/sidekiq.rb
@@ -9,6 +9,9 @@ end
 
 Sidekiq.configure_server do |config|
   config.redis = redis_params
+  config.client_middleware do |chain|
+    chain.add Mastodon::UniqueRetryJobMiddleware
+  end
 end
 
 Sidekiq.configure_client do |config|