diff --git a/src/System.Management.Automation/engine/WinRT/IInspectable.cs b/src/System.Management.Automation/engine/WinRT/IInspectable.cs
index abc589b487..28544d42af 100644
--- a/src/System.Management.Automation/engine/WinRT/IInspectable.cs
+++ b/src/System.Management.Automation/engine/WinRT/IInspectable.cs
@@ -4,6 +4,7 @@
 using System.Reflection;
 using System.Runtime.InteropServices;
 
+#nullable enable
 namespace System.Management.Automation
 {
     /// <summary>