diff --git a/src/Squidex/Areas/Api/Config/Swagger/XmlResponseTypesProcessor.cs b/src/Squidex/Areas/Api/Config/Swagger/XmlResponseTypesProcessor.cs
index 0c3d8f00f..ebab2b885 100644
--- a/src/Squidex/Areas/Api/Config/Swagger/XmlResponseTypesProcessor.cs
+++ b/src/Squidex/Areas/Api/Config/Swagger/XmlResponseTypesProcessor.cs
@@ -5,7 +5,6 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using NJsonSchema.Infrastructure;