diff --git a/src/Microsoft.PowerShell.GlobalTool.Shim/GlobalToolShim.cs b/src/Microsoft.PowerShell.GlobalTool.Shim/GlobalToolShim.cs
index c8e95628687..6b5044e2d81 100644
--- a/src/Microsoft.PowerShell.GlobalTool.Shim/GlobalToolShim.cs
+++ b/src/Microsoft.PowerShell.GlobalTool.Shim/GlobalToolShim.cs
@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Runtime.InteropServices;