diff --git a/app/controllers/v1/collections_controller.rb b/app/controllers/v1/collections_controller.rb
index c419f856f07d27793de8a2708f6d210bac89a68a..0af933b464c31bb0e753c9097399f5564fc0780d 100644
--- a/app/controllers/v1/collections_controller.rb
+++ b/app/controllers/v1/collections_controller.rb
@@ -43,7 +43,7 @@ class V1::CollectionsController < ApplicationController
   # PUT/PATCH /v1/users/1.json
   def update
     if @collection.update(collection_params)
-      @collection.add_items(extra_params[:items]) unless extra_params[:items].is_nil?
+      @collection.add_items(extra_params[:items]) unless extra_params[:items].nil?
       render json: @collection, status: :ok
     else
       render json: @collection.errors, status: :unprocessable_entity