diff --git a/app/models/form/sales/questions/buyer1_previous_tenure.rb b/app/models/form/sales/questions/buyer1_previous_tenure.rb
index f075e615c..4336865d1 100644
--- a/app/models/form/sales/questions/buyer1_previous_tenure.rb
+++ b/app/models/form/sales/questions/buyer1_previous_tenure.rb
@@ -17,5 +17,6 @@ class Form::Sales::Questions::Buyer1PreviousTenure < ::Form::Question
     "6" => { "value" => "Living with family or friends" },
     "7" => { "value" => "Temporary accomodation" },
     "9" => { "value" => "Other" },
+    "0" => { "value" => "Don’t know" },
   }.freeze
 end
diff --git a/spec/models/form/sales/questions/buyer1_previous_tenure_spec.rb b/spec/models/form/sales/questions/buyer1_previous_tenure_spec.rb
index ae1da940a..373d819f1 100644
--- a/spec/models/form/sales/questions/buyer1_previous_tenure_spec.rb
+++ b/spec/models/form/sales/questions/buyer1_previous_tenure_spec.rb
@@ -41,6 +41,7 @@ RSpec.describe Form::Sales::Questions::Buyer1PreviousTenure, type: :model do
       "6" => { "value" => "Living with family or friends" },
       "7" => { "value" => "Temporary accomodation" },
       "9" => { "value" => "Other" },
+      "0" => { "value" => "Don’t know" },
     })
   end
 end