diff --git a/app/logical/backup_service.rb b/app/logical/backup_service.rb
index b3fac3b64..c34cdc339 100644
--- a/app/logical/backup_service.rb
+++ b/app/logical/backup_service.rb
@@ -2,4 +2,8 @@ class BackupService
   def backup(file_path, options = {})
     raise NotImplementedError.new("#{self.class}.backup not implemented")
   end
+
+  def delete(file_path, options = {})
+    raise NotImplementedError.new("#{self.class}.delete not implemented")
+  end
 end
diff --git a/app/logical/null_backup_service.rb b/app/logical/null_backup_service.rb
index 48f60bdd4..3c15b0f10 100644
--- a/app/logical/null_backup_service.rb
+++ b/app/logical/null_backup_service.rb
@@ -2,4 +2,8 @@ class NullBackupService
   def backup(file_path, options = {})
     # do nothing
   end
+
+  def delete(file_path, options = {})
+    # do nothing
+  end
 end
diff --git a/app/models/post.rb b/app/models/post.rb
index 2c19821c7..33689179c 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -74,6 +74,7 @@ class Post < ApplicationRecord
           end
         end
 
+        backup_service = Danbooru.config.backup_service
         backup_service.delete(file_path, type: :original)
         backup_service.delete(large_file_path, type: :large)
         backup_service.delete(preview_file_path, type: :preview)