diff --git a/lib/app.rb b/lib/app.rb
index 8e1a1f87..b5015b3a 100644
--- a/lib/app.rb
+++ b/lib/app.rb
@@ -133,7 +133,7 @@ class App < Sinatra::Application
     end
 
     def canonical_origin
-      "http://#{request.host_with_port}"
+      "https://#{request.host_with_port}"
     end
 
     def browser