diff --git a/app/models/lettings_log.rb b/app/models/lettings_log.rb
index 87daab66a..91d063656 100644
--- a/app/models/lettings_log.rb
+++ b/app/models/lettings_log.rb
@@ -261,7 +261,7 @@ class LettingsLog < Log
 
   def previous_postcode_known?
     # 0: Yes
-    postcode_known&.zero?
+    ppcodenk&.zero?
   end
 
   def previous_la_known?