diff --git a/lib/session_encryptor.rb b/lib/session_encryptor.rb
index 2016fcbc274..8805a9b4cef 100644
--- a/lib/session_encryptor.rb
+++ b/lib/session_encryptor.rb
@@ -24,7 +24,6 @@ class SensitiveValueError < StandardError; end
   ]
 
   SENSITIVE_DEFAULT_FIELDS = Idp::Constants::DEFAULT_MOCK_PII_FROM_DOC.slice(
-    :first_name,
     :last_name,
     :address1,
     :city,
diff --git a/spec/lib/session_encryptor_spec.rb b/spec/lib/session_encryptor_spec.rb
index e3cb6db36f6..7c5d56cc8dc 100644
--- a/spec/lib/session_encryptor_spec.rb
+++ b/spec/lib/session_encryptor_spec.rb
@@ -171,7 +171,7 @@
 
       it 'raises if sensitive value is not KMS encrypted' do
         session = {
-          'new_key' => Idp::Constants::DEFAULT_MOCK_PII_FROM_DOC[:first_name],
+          'new_key' => Idp::Constants::DEFAULT_MOCK_PII_FROM_DOC[:last_name],
         }
 
         expect {