diff --git a/src/Elastic.Apm/Helpers/CookieHeaderParser.cs b/src/Elastic.Apm/Helpers/CookieHeaderParser.cs
index cc378bf1c..3a4285150 100644
--- a/src/Elastic.Apm/Helpers/CookieHeaderParser.cs
+++ b/src/Elastic.Apm/Helpers/CookieHeaderParser.cs
@@ -1,8 +1,10 @@
-// one or more agreements.
+// Licensed to Elasticsearch B.V under one or more agreements.
 // Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
 // See the LICENSE file in the project root for more information
 
+#if !NETFRAMEWORK
 using System;
+#endif
 using System.Collections.Generic;
 
 namespace Elastic.Apm.Helpers;