diff --git a/app/controllers/vehicles_controller.rb b/app/controllers/vehicles_controller.rb
index d6832cb..aaf5268 100644
--- a/app/controllers/vehicles_controller.rb
+++ b/app/controllers/vehicles_controller.rb
@@ -110,7 +110,7 @@ class VehiclesController < ApplicationController
   
   # returns a dynamic list of vehicles owned by a customer
   def update_vehicles
-    @vehicles = Customer.find_by_id(params[:customer].to_i).vehicles
+    @vehicles = Customer.find_by_id(params[:customer_id].to_i).vehicles
     respond_to do |format|
       format.js
     end