diff --git a/src/DotNetty.Common/Concurrency/ScheduledTask.cs b/src/DotNetty.Common/Concurrency/ScheduledTask.cs
index 380a45a17..b46579ca3 100644
--- a/src/DotNetty.Common/Concurrency/ScheduledTask.cs
+++ b/src/DotNetty.Common/Concurrency/ScheduledTask.cs
@@ -29,7 +29,7 @@ protected ScheduledTask(AbstractScheduledEventExecutor executor, PreciseTimeSpan
 
         public bool Cancel()
         {
-            if (!this.AtomicCancellationStateUpdate(CancellationProhibited, CancellationRequested))
+            if (!this.AtomicCancellationStateUpdate(CancellationRequested, CancellationProhibited))
             {
                 return false;
             }