diff --git a/config.ru b/config.ru
index de0400f4f67..c4bef72308e 100644
--- a/config.ru
+++ b/config.ru
@@ -23,5 +23,6 @@ warmup do |app|
 end
 
 map ENV['RAILS_RELATIVE_URL_ROOT'] || "/" do
+  use Gitlab::ReleaseController
   run Gitlab::Application
 end
diff --git a/lib/gitlab/middleware/read_only.rb b/lib/gitlab/middleware/read_only.rb
index c26656704d7..a68c6c3d15c 100644
--- a/lib/gitlab/middleware/read_only.rb
+++ b/lib/gitlab/middleware/read_only.rb
@@ -28,7 +28,7 @@ module Gitlab
           end
         end
 
-        @app.call(env)
+        @app.call(env).tap { @env = nil }
       end
 
       private
diff --git a/lib/gitlab/middleware/release_controller.rb b/lib/gitlab/middleware/release_controller.rb
new file mode 100644
index 00000000000..a21d718d51c
--- /dev/null
+++ b/lib/gitlab/middleware/release_controller.rb
@@ -0,0 +1,9 @@
+module Gitlab
+  module Middleware
+    ReleaseController = Struct.new(:app) do
+      def call(env)
+        app.call(env).tap { env.delete('action_controller.instance') }
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/middleware/release_controller_spec.rb b/spec/lib/gitlab/middleware/release_controller_spec.rb
new file mode 100644
index 00000000000..854bac6e751
--- /dev/null
+++ b/spec/lib/gitlab/middleware/release_controller_spec.rb
@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+describe Gitlab::Middleware::ReleaseController do
+  let(:inner_app) { double(:app) }
+  let(:app) { described_class.new(inner_app) }
+  let(:env) { { 'action_controller.instance' => 'something' } }
+
+  before do
+    expect(inner_app).to receive(:call).with(env).and_return('yay')
+  end
+
+  describe '#call' do
+    it 'calls the app and delete the controller' do
+      result = app.call(env)
+
+      expect(result).to eq('yay')
+      expect(env).to be_empty
+    end
+  end
+end