diff --git a/src/System.Management.Automation/engine/SessionStatePublic.cs b/src/System.Management.Automation/engine/SessionStatePublic.cs
index 8f010cb65d..ce14d4948d 100644
--- a/src/System.Management.Automation/engine/SessionStatePublic.cs
+++ b/src/System.Management.Automation/engine/SessionStatePublic.cs
@@ -336,6 +336,7 @@ namespace System.Management.Automation
         Private = 1
     }
 
+#nullable enable
     internal interface IHasSessionStateEntryVisibility
     {
         SessionStateEntryVisibility Visibility { get; set; }