diff --git a/spec/lib/gitlab/mail_room/mail_room_spec.rb b/spec/lib/gitlab/mail_room/mail_room_spec.rb
index ab9a9a035f13bc2e0877adcb70028b1cb041b9a3..a42da4ad3e0300d545ab9008ab41667029f60764 100644
--- a/spec/lib/gitlab/mail_room/mail_room_spec.rb
+++ b/spec/lib/gitlab/mail_room/mail_room_spec.rb
@@ -33,6 +33,10 @@ RSpec.describe Gitlab::MailRoom do
     described_class.instance_variable_set(:@enabled_configs, nil)
   end
 
+  after do
+    described_class.instance_variable_set(:@enabled_configs, nil)
+  end
+
   describe '#enabled_configs' do
     before do
       allow(described_class).to receive(:load_yaml).and_return(configs)