diff --git a/common/ASC.Data.Storage/Configuration/Appender.cs b/common/ASC.Data.Storage/Configuration/Appender.cs
index d720c2059c..3cff660614 100644
--- a/common/ASC.Data.Storage/Configuration/Appender.cs
+++ b/common/ASC.Data.Storage/Configuration/Appender.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Configuration;
 using System.Linq;
 
 using ASC.Common;