diff --git a/app/controllers/readings_controller.rb b/app/controllers/readings_controller.rb
index 058d701..103f3f0 100644
--- a/app/controllers/readings_controller.rb
+++ b/app/controllers/readings_controller.rb
@@ -28,7 +28,7 @@ class ReadingsController < ActionController::API
         end
       end
 
-      if reading.save
+      if raspberry.save
         render plain: reading.id, status: :ok
       else
         head :bad_request