diff --git a/test/test_clock.rb b/test/test_clock.rb
index 0a6422f..531ddde 100644
--- a/test/test_clock.rb
+++ b/test/test_clock.rb
@@ -113,7 +113,7 @@ class TestClock < Sidetiq::TestCase
   end
 
   class SplatArgsWorker
-    def perform arg1, *args
+    def perform(arg1, *args)
     end
   end