diff --git a/config.ru b/config.ru
index c4c4031568..e2d03deb47 100644
--- a/config.ru
+++ b/config.ru
@@ -5,8 +5,12 @@ if ENV.fetch('KILL_UNICORNS', false) && ['production', 'staging'].include?(ENV['
   # - performed between 25000 and 30000 requests
   # - grown in memory usage to between 700 and 850 MB
   require 'unicorn/worker_killer'
-  use Unicorn::WorkerKiller::MaxRequests, 25_000, 30_000
-  use Unicorn::WorkerKiller::Oom, (700 * (1024**2)), (850 * (1024**2))
+  use Unicorn::WorkerKiller::MaxRequests,
+      ENV.fetch('UWK_REQS_MIN', 25_000).to_i,
+      ENV.fetch('UWK_REQS_MAX', 30_000).to_i
+  use Unicorn::WorkerKiller::Oom,
+      ( ENV.fetch('UWK_MEM_MIN', 700).to_i * (1024**2) ),
+      ( ENV.fetch('UWK_MEM_MAX', 850).to_i * (1024**2) )
 end
 
 require ::File.expand_path('../config/environment', __FILE__)