diff --git a/oidc_provider/lib/endpoints/authorize.py b/oidc_provider/lib/endpoints/authorize.py
index 2f214c9..51a75c6 100644
--- a/oidc_provider/lib/endpoints/authorize.py
+++ b/oidc_provider/lib/endpoints/authorize.py
@@ -37,6 +37,7 @@ logger = logging.getLogger(__name__)
 
 class AuthorizeEndpoint(object):
     _allowed_prompt_params = {'none', 'login', 'consent', 'select_account'}
+    client_class = Client
 
     def __init__(self, request):
         self.request = request
@@ -86,7 +87,7 @@ class AuthorizeEndpoint(object):
     def validate_params(self):
         # Client validation.
         try:
-            self.client = Client.objects.get(client_id=self.params['client_id'])
+            self.client = self.client_class.objects.get(client_id=self.params['client_id'])
         except Client.DoesNotExist:
             logger.debug('[Authorize] Invalid client identifier: %s', self.params['client_id'])
             raise ClientIdError()
diff --git a/oidc_provider/views.py b/oidc_provider/views.py
index b18cd5d..3246ca6 100644
--- a/oidc_provider/views.py
+++ b/oidc_provider/views.py
@@ -61,9 +61,10 @@ OIDC_TEMPLATES = settings.get('OIDC_TEMPLATES')
 
 
 class AuthorizeView(View):
-    def get(self, request, *args, **kwargs):
+    authorize_endpoint_class = AuthorizeEndpoint
 
-        authorize = AuthorizeEndpoint(request)
+    def get(self, request, *args, **kwargs):
+        authorize = self.authorize_endpoint_class(request)
 
         try:
             authorize.validate_params()