diff --git a/ThirdParty/SmartThreadPool/SmartThreadPool.cs b/ThirdParty/SmartThreadPool/SmartThreadPool.cs
index 9043d3a1bb..8e427324f2 100644
--- a/ThirdParty/SmartThreadPool/SmartThreadPool.cs
+++ b/ThirdParty/SmartThreadPool/SmartThreadPool.cs
@@ -1684,6 +1684,7 @@ namespace Amib.Threading
             }
 	        workItemsGroup.Start();
             anActionCompleted.WaitOne();
+            anActionCompleted.Dispose();
 
             return choiceIndex._index;
         }