diff --git a/src/SharpCompress/NotNullExtensions.cs b/src/SharpCompress/NotNullExtensions.cs
index d2ba87a3..88e95c41 100644
--- a/src/SharpCompress/NotNullExtensions.cs
+++ b/src/SharpCompress/NotNullExtensions.cs
@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using System.Runtime.CompilerServices;
 
 namespace SharpCompress;