diff --git a/config/initializers/4_sidekiq.rb b/config/initializers/4_sidekiq.rb
index 75c543c0f4..e856499732 100644
--- a/config/initializers/4_sidekiq.rb
+++ b/config/initializers/4_sidekiq.rb
@@ -15,7 +15,7 @@ Sidekiq.configure_server do |config|
 
   config.server_middleware do |chain|
     chain.add Gitlab::SidekiqMiddleware::ArgumentsLogger if ENV['SIDEKIQ_LOG_ARGUMENTS']
-    chain.add Gitlab::SidekiqMiddleware::MemoryKiller if ENV['SIDEKIQ_MAX_RSS']
+    chain.add Gitlab::SidekiqMiddleware::MemoryKiller if ENV['SIDEKIQ_MEMORY_KILLER_MAX_RSS']
   end
 end