diff --git a/app/controllers/problems_controller.rb b/app/controllers/problems_controller.rb
--- a/app/controllers/problems_controller.rb
+++ b/app/controllers/problems_controller.rb
@@ -123,7 +123,7 @@
     @problem = Problem.find(params[:id])
     @problem.update_attributes(available: !(@problem.available) )
     respond_to do |format|
-      format.js {}
+      format.js { }
     end
   end