diff --git a/app/models/derived_variables/lettings_log_variables.rb b/app/models/derived_variables/lettings_log_variables.rb
index 8cabf1ce5..42dadf43c 100644
--- a/app/models/derived_variables/lettings_log_variables.rb
+++ b/app/models/derived_variables/lettings_log_variables.rb
@@ -375,6 +375,7 @@ private
     self.address_line2 = nil
     self.town_or_city = nil
     self.county = nil
+    self.postcode_full = nil
   end
 
   def address_answered_without_uprn?
diff --git a/app/models/derived_variables/sales_log_variables.rb b/app/models/derived_variables/sales_log_variables.rb
index a570abc35..18b26ad85 100644
--- a/app/models/derived_variables/sales_log_variables.rb
+++ b/app/models/derived_variables/sales_log_variables.rb
@@ -258,10 +258,10 @@ private
     self.address_line2 = nil
     self.town_or_city = nil
     self.county = nil
+    self.postcode_full = nil
     self.pcode1 = nil
     self.pcode2 = nil
     self.pcodenk = nil
-    self.postcode_full = nil
     self.is_la_inferred = nil
     self.la = nil
   end