diff --git a/test/console/color_test.rb b/test/console/color_test.rb
index 65600c253..8f62dce45 100644
--- a/test/console/color_test.rb
+++ b/test/console/color_test.rb
@@ -94,7 +94,7 @@ def test_colorize_does_not_color_string_if_do_not_use_colorize
       CONFIG[:no_color] = nil
     end
 
-    SESSION_class = Struct.new('SESSION')
+    SESSION_class = Struct.new('SESSION', :a)
 
     private