diff --git a/SystemExtensions/Threading/PriorityThreadPool.cs b/SystemExtensions/Threading/PriorityThreadPool.cs
index 4f98085..dd9febc 100644
--- a/SystemExtensions/Threading/PriorityThreadPool.cs
+++ b/SystemExtensions/Threading/PriorityThreadPool.cs
@@ -13,7 +13,7 @@ namespace SystemExtensions.Threading
     /// Features both an automated algorithm to calibrate the number of active threads and a Constructor for constructing
     /// a threadpool manually, without the auto-managed pool algorithm.
     /// </summary>
-    public sealed class PriorityThreadPool : IDisposable
+    public class PriorityThreadPool : IDisposable
     {
         private class QueueEntry : IComparable<QueueEntry>
         {