diff --git a/src/System.Management.Automation/engine/SessionStatePublic.cs b/src/System.Management.Automation/engine/SessionStatePublic.cs
index aa8932470ff..2eacaa9e56a 100644
--- a/src/System.Management.Automation/engine/SessionStatePublic.cs
+++ b/src/System.Management.Automation/engine/SessionStatePublic.cs
@@ -336,6 +336,7 @@ public enum SessionStateEntryVisibility
         Private = 1
     }
 
+#nullable enable
     internal interface IHasSessionStateEntryVisibility
     {
         SessionStateEntryVisibility Visibility { get; set; }