diff --git a/test/concurrency/test_ulid_monotonic_generator_thread_safety.rb b/test/concurrency/test_ulid_monotonic_generator_thread_safety.rb
index ffb34432..695a7dc2 100644
--- a/test/concurrency/test_ulid_monotonic_generator_thread_safety.rb
+++ b/test/concurrency/test_ulid_monotonic_generator_thread_safety.rb
@@ -41,7 +41,7 @@ def test_thread_safe_generate_without_arguments
       ulids_by_the_time.keys.all?(possible_period)
     end
 
-    ulids_by_the_time.sort.each do |_time, ulids_in_the_time|
+    ulids_by_the_time.sort.each do |(_time, ulids_in_the_time)|
       ulids_in_the_time.sort.each_cons(2) do |pred, succ|
         assert do
           pred.to_i.succ == succ.to_i