diff --git a/ThirdParty/SmartThreadPool/WorkItem.cs b/ThirdParty/SmartThreadPool/WorkItem.cs
index e0b106f38b..db78b1019f 100644
--- a/ThirdParty/SmartThreadPool/WorkItem.cs
+++ b/ThirdParty/SmartThreadPool/WorkItem.cs
@@ -634,7 +634,7 @@ namespace Amib.Threading.Internal
                 {
                     return m_workItemState;
                 }
-                if (WorkItemState.Canceled != _workItemState && DateTime.UtcNow.Ticks > _expirationTime)
+                if (WorkItemState.Canceled != m_workItemState && DateTime.UtcNow.Ticks > m_expirationTime)
                 {
                     m_workItemState = WorkItemState.Canceled;
                     return m_workItemState;