diff --git a/lib/project_euler_cli/problem.rb b/lib/project_euler_cli/problem.rb
index <HASH>..<HASH> 100644
--- a/lib/project_euler_cli/problem.rb
+++ b/lib/project_euler_cli/problem.rb
@@ -1,7 +1,7 @@
 module ProjectEulerCli
 
 class Problem
-  attr_accessor :id, :title, :published, :solved_by, :difficulty
+  attr_accessor :title, :published, :solved_by, :difficulty
 
   @@total = 0
Remove unused id attribute from Problem class