diff --git a/src/System.Management.Automation/engine/parser/Position.cs b/src/System.Management.Automation/engine/parser/Position.cs
index 24ce0d118a2..5e967e432b6 100644
--- a/src/System.Management.Automation/engine/parser/Position.cs
+++ b/src/System.Management.Automation/engine/parser/Position.cs
@@ -51,12 +51,13 @@ public interface IScriptPosition
     /// <summary>
     /// Represents the a span of text in a script.
     /// </summary>
+#nullable enable
     public interface IScriptExtent
     {
         /// <summary>
         /// The filename the extent includes, or null if the extent is not included in any file.
         /// </summary>
-        string File { get; }
+        string? File { get; }
 
         /// <summary>
         /// The starting position of the extent.
@@ -103,6 +104,7 @@ public interface IScriptExtent
         /// </summary>
         int EndOffset { get; }
     }
+#nullable restore
 
     /// <summary>
     /// A few utility functions for script positions.