diff --git a/tests/py/test_pages.py b/tests/py/test_pages.py
index 7880a46e05..87bfa275ac 100644
--- a/tests/py/test_pages.py
+++ b/tests/py/test_pages.py
@@ -96,6 +96,12 @@ def test_sign_out_overwrites_session_cookie(self):
         assert response.code == 302
         assert response.headers.cookie[SESSION].value == ''
 
+    def test_sign_out_doesnt_redirect_xhr(self):
+        self.make_participant('alice')
+        response = self.client.PxST('/sign-out.html', auth_as='alice',
+                                    HTTP_X_REQUESTED_WITH=b'XMLHttpRequest')
+        assert response.code == 200
+
     def test_receipts_signed_in(self):
         self.make_participant('alice', claimed_time='now')
         self.db.run("INSERT INTO exchanges (id, participant, amount, fee) "
diff --git a/www/sign-out.html.spt b/www/sign-out.html.spt
index cf2e2740d3..7965d58c55 100644
--- a/www/sign-out.html.spt
+++ b/www/sign-out.html.spt
@@ -8,6 +8,9 @@ if user.ANON:
 if POST:
     user.sign_out(response.headers.cookie)
 
+    if request.headers.get('X-Requested-With') == 'XMLHttpRequest':
+        raise Response(200)
+
     if 'back_to' in request.body:
         back_to = request.body['back_to']
     else: