diff --git a/app/workers/activitypub/delivery_worker.rb b/app/workers/activitypub/delivery_worker.rb
index 79f1e8153..818fd8f5d 100644
--- a/app/workers/activitypub/delivery_worker.rb
+++ b/app/workers/activitypub/delivery_worker.rb
@@ -54,7 +54,7 @@ class ActivityPub::DeliveryWorker
   end
 
   def response_error_unsalvageable?(response)
-    (400...500).cover?(response.code) && ![401, 408, 429].include?(response.code)
+    response.code == 501 || ((400...500).cover?(response.code) && ![401, 408, 429].include?(response.code))
   end
 
   def failure_tracker