diff --git a/test/mrb_set.rb b/test/mrb_set.rb
index e632a68c9..d8c838178 100644
--- a/test/mrb_set.rb
+++ b/test/mrb_set.rb
@@ -636,5 +636,7 @@ end
 #    }
 #  end
 #
-#assert("Set#inspect") do
-#end
+assert("Set#inspect") do
+  set = Set[1,2,3]
+  assert_equal("#<Set: {1, 2, 3}>", set.inspect)
+end