diff --git a/lib/sidetiq/clock.rb b/lib/sidetiq/clock.rb
index 7f6738e..20089ce 100644
--- a/lib/sidetiq/clock.rb
+++ b/lib/sidetiq/clock.rb
@@ -1,6 +1,6 @@
 module Sidetiq
   configure do |config|
-    config.priority = Thread.current.priority
+    config.priority = Thread.main.priority
     config.resolution = 0.2
   end