diff --git a/app/models/lettings_log.rb b/app/models/lettings_log.rb
index 47ca80705..6838346d1 100644
--- a/app/models/lettings_log.rb
+++ b/app/models/lettings_log.rb
@@ -714,9 +714,17 @@ class LettingsLog < Log
 
   def process_postcode_changes!
     self.postcode_full = upcase_and_remove_whitespace(postcode_full)
+
+    if is_renewal?
+      self.ppostcode_full = upcase_and_remove_whitespace(postcode_full)
+    end
+
     return if postcode_full.blank?
 
     self.postcode_known = 1
+    if is_renewal?
+      self.ppcodenk = 0
+    end
     inferred_la = get_inferred_la(postcode_full)
     self.is_la_inferred = inferred_la.present?
     self.la = inferred_la if inferred_la.present?
diff --git a/spec/models/lettings_log_derived_fields_spec.rb b/spec/models/lettings_log_derived_fields_spec.rb
index e4edb194e..b2979ca61 100644
--- a/spec/models/lettings_log_derived_fields_spec.rb
+++ b/spec/models/lettings_log_derived_fields_spec.rb
@@ -1016,11 +1016,13 @@ RSpec.describe LettingsLog, type: :model do
       postcode = "SW1A 1AA"
       log.assign_attributes(postcode_known: 1, postcode_full: postcode, renewal: 1)
 
-      expect { log.send :process_postcode_changes! }.to change(log, :la).to(expected_la)
-      expect { log.set_derived_fields! }
-        .to change(log, :ppostcode_full).to(postcode)
+      expect { log.send :process_postcode_changes! }
+        .to change(log, :la).to(expected_la)
+        .and change(log, :ppostcode_full).to(postcode)
         .and change(log, :ppcodenk).to(0)
-        .and change(log, :prevloc).to(expected_la)
+
+      expect { log.set_derived_fields! }
+        .to change(log, :prevloc).to(expected_la)
     end
 
     it "clears values for previous location and related fields when log is a renewal and current values are cleared" do