diff --git a/test/DotNetty.Handlers.Tests/IPSubnetFilterTest.cs b/test/DotNetty.Handlers.Tests/IPSubnetFilterTest.cs
index fbdf60926..04c0e7585 100644
--- a/test/DotNetty.Handlers.Tests/IPSubnetFilterTest.cs
+++ b/test/DotNetty.Handlers.Tests/IPSubnetFilterTest.cs
@@ -96,6 +96,8 @@ public void TestIPFilterRuleHandler()
             {
                 Assert.Equal(i, output.ReadByte());
             }
+            //waiting finish of ContinueWith for chDeny.ChannelRejected
+            Thread.Sleep(300);
             Assert.False(chDeny.Active);
             Assert.False(chDeny.Open);
             RuleBasedIPFilter allowHandler = new TestAllowFilter(filter0);