diff --git a/app/services/post_action_notifier.rb b/app/services/post_action_notifier.rb
index 909e26321bf..7644611cbda 100644
--- a/app/services/post_action_notifier.rb
+++ b/app/services/post_action_notifier.rb
@@ -4,6 +4,7 @@ class PostActionNotifier
 
   def self.disable
     @disabled = true
+    @custom_post_revision_notifier_recipients = nil
   end
 
   def self.enable
diff --git a/spec/services/post_action_notifier_spec.rb b/spec/services/post_action_notifier_spec.rb
index dda44134634..746c193b7b1 100644
--- a/spec/services/post_action_notifier_spec.rb
+++ b/spec/services/post_action_notifier_spec.rb
@@ -108,10 +108,6 @@ describe PostActionNotifier do
         end
       end
 
-      after do
-        DiscoursePluginRegistry.reset!
-      end
-
       it 'notifies the specified user of the revision' do
         expect {
           post.revise(evil_trout, raw: "world is the new body of the message")