diff --git a/oauth2/utils.py b/oauth2/utils.py
index 2cb7550..ba802aa 100644
--- a/oauth2/utils.py
+++ b/oauth2/utils.py
@@ -49,7 +49,7 @@ def psa(redirect_uri=None):
     def decorator(func):
         @wraps(func)
         def wrapper(self, request, *args, **kwargs):
-            backend = 'facebook'
+            backend = self.kwargs.get('backend', None)
             uri = redirect_uri
             if uri and not uri.startswith('/'):
                 uri = reverse(redirect_uri, args=(backend,))
diff --git a/profile/urls.py b/profile/urls.py
index 89266d8..916c87c 100644
--- a/profile/urls.py
+++ b/profile/urls.py
@@ -13,7 +13,7 @@
         views.AuthenticateViewSet.as_view({'post': 'create'}),
         name='sign-in'),
 
-    url(r'^users/auth', OAuth2View.as_view(),
+    url(r'^users/auth/(?P<backend>[^/]+)', OAuth2View.as_view(),
         name='register_by_access_token'),
 ]