diff --git a/gitlab-webservice/configuration/puma.rb b/gitlab-webservice/configuration/puma.rb
index e85c36a37977fa618915c5f16fda8eea59e3d01c..534418f833a24a21bc1cd299c803cbb841b52085 100644
--- a/gitlab-webservice/configuration/puma.rb
+++ b/gitlab-webservice/configuration/puma.rb
@@ -79,7 +79,7 @@ end
 
 # https://github.com/puma/puma/blob/master/5.0-Upgrade.md#nakayoshi_fork
 if defined?(nakayoshi_fork)
-  nakayoshi_fork unless ENV['DISABLE_PUMA_NAKAYOSHI_FORK'] == 'true'
+  nakayoshi_fork if ENV['ENABLE_PUMA_NAKAYOSHI_FORK'] == 'true'
 end
 
 # Use json formatter