diff --git a/app/models/account.rb b/app/models/account.rb
index 6ef1aed9..f47eae2f 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -70,7 +70,7 @@ class Account < ApplicationRecord
   include DomainNormalizable
 
   SPAM_FLAG_CLASS_MAP = {
-    none: 0,
+    none: nil,
     spam: 1,
     safe: 2,
   }.freeze