diff --git a/PathLib/Utils/LinqBridge.cs b/PathLib/Utils/LinqBridge.cs
index c4b4d3e..4bc42d9 100644
--- a/PathLib/Utils/LinqBridge.cs
+++ b/PathLib/Utils/LinqBridge.cs
@@ -35,13 +35,6 @@
 
 #pragma warning disable 1591
 
-namespace System.Runtime.CompilerServices
-{
-    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class
-         | AttributeTargets.Method)]
-    public sealed class ExtensionAttribute : Attribute { }
-}
-
 namespace PathLib.Utils
 {
     /// <summary>