diff --git a/app/controllers/user_controller.rb b/app/controllers/user_controller.rb
index 2e9b6e42..52a1d24e 100644
--- a/app/controllers/user_controller.rb
+++ b/app/controllers/user_controller.rb
@@ -1,6 +1,6 @@
 class UserController < ApplicationController
   def show
-    @user = User.find_by_screen_name(params[:username])
+    @user = User.find_by_screen_name!(params[:username])
   end
 
   def edit