diff --git a/spec/factories/lettings_log.rb b/spec/factories/lettings_log.rb
index b7547facb..ae5b21b4b 100644
--- a/spec/factories/lettings_log.rb
+++ b/spec/factories/lettings_log.rb
@@ -38,7 +38,7 @@ FactoryBot.define do
       address_line1 { "same address line 1" }
       postcode_full { "A1 1AA" }
       uprn_known { 1 }
-      uprn { "1234567890" }
+      uprn { "1234567890123" }
       declaration { 1 }
       age1_known { 0 }
       age1 { 18 }