diff --git a/combo/manager/views.py b/combo/manager/views.py
index bae8a641..9d211846 100644
--- a/combo/manager/views.py
+++ b/combo/manager/views.py
@@ -74,7 +74,7 @@ class SiteImportView(FormView):
 
     def form_valid(self, form):
         try:
-            json_site = json.load(self.request.FILES['site_json'])
+            json_site = json.loads(force_text(self.request.FILES['site_json'].read()))
         except ValueError:
             form.add_error('site_json', _('File is not in the expected JSON format.'))
             return self.form_invalid(form)