diff --git a/app/controllers/admin/api_controller.rb b/app/controllers/admin/api_controller.rb
index 7861b2cfcf0..82aef9103f9 100644
--- a/app/controllers/admin/api_controller.rb
+++ b/app/controllers/admin/api_controller.rb
@@ -1,7 +1,7 @@
 class Admin::ApiController < Admin::AdminController
 
   def index
-    render_serialized(ApiKey.all, ApiKeySerializer)
+    render_serialized(ApiKey.all.to_a, ApiKeySerializer)
   end
 
   def regenerate_key