diff --git a/app/admin.rb b/app/admin.rb
index 80f751d8..cd23a98b 100644
--- a/app/admin.rb
+++ b/app/admin.rb
@@ -191,6 +191,14 @@ post '/admin/feature' do
   redirect '/admin'
 end
 
+get '/admin/masquerade/:username' do
+  require_admin
+  site = Site[username: params[:username]]
+  not_found if site.nil?
+  session[:id] = site.id
+  redirect '/'
+end
+
 def require_admin
   redirect '/' unless signed_in? && current_site.is_admin
 end