diff --git a/src/System.Management.Automation/engine/CommandInfo.cs b/src/System.Management.Automation/engine/CommandInfo.cs
index d1afb8b3b12..f122d205a90 100644
--- a/src/System.Management.Automation/engine/CommandInfo.cs
+++ b/src/System.Management.Automation/engine/CommandInfo.cs
@@ -992,6 +992,7 @@ private static string GetMemberTypeProjection(string typename, IList<PSMemberNam
         public IList<PSMemberNameAndType> Members { get; }
     }
 
+#nullable enable
     internal interface IScriptCommandInfo
     {
         ScriptBlock ScriptBlock { get; }