diff --git a/app/main/views/sign_out.py b/app/main/views/sign_out.py
index d4add09ea..de0ca58e1 100644
--- a/app/main/views/sign_out.py
+++ b/app/main/views/sign_out.py
@@ -8,7 +8,6 @@ from app.main import main
 @main.route('/sign-out', methods=(['GET']))
 @login_required
 def sign_out():
-    if session.get('service_name', None):
-        session.pop('service_name')
+    session.clear()
     logout_user()
     return redirect(url_for('main.index'))
diff --git a/tests/app/main/views/test_sign_out.py b/tests/app/main/views/test_sign_out.py
index cf7b5a665..1be46f423 100644
--- a/tests/app/main/views/test_sign_out.py
+++ b/tests/app/main/views/test_sign_out.py
@@ -1,6 +1,4 @@
-from datetime import datetime
 from flask import url_for
-from app.main.dao import users_dao
 
 
 def test_render_sign_out_redirects_to_sign_in(app_):
@@ -24,6 +22,8 @@ def test_sign_out_user(app_,
         email = 'valid@example.gov.uk'
         password = 'val1dPassw0rd!'
         with app_.test_client() as client:
+            with client.session_transaction() as session:
+                print('session: {}'.format(session))
             client.login(api_user_active)
             # Check we are logged in
             response = client.get(
@@ -33,3 +33,4 @@ def test_sign_out_user(app_,
             assert response.status_code == 302
             assert response.location == url_for(
                 'main.index', _external=True)
+            assert session.get('ItsdangerousSession') is None