take some extra effort cleaning up
diff --git a/src/log4net.Tests/Appender/AsyncAppenderTest.cs b/src/log4net.Tests/Appender/AsyncAppenderTest.cs
index 1165082..91338fb 100644
--- a/src/log4net.Tests/Appender/AsyncAppenderTest.cs
+++ b/src/log4net.Tests/Appender/AsyncAppenderTest.cs
@@ -53,6 +53,8 @@
         [TearDown]
         public void ResetRepository() {
             hierarchy.ResetConfiguration();
+            hierarchy.Shutdown();
+            hierarchy.Clear();
         }
 
         [Test]