diff --git a/src/System.Management.Automation/engine/interpreter/LocalAccess.cs b/src/System.Management.Automation/engine/interpreter/LocalAccess.cs
index 7b0711b1930..30596866c0c 100644
--- a/src/System.Management.Automation/engine/interpreter/LocalAccess.cs
+++ b/src/System.Management.Automation/engine/interpreter/LocalAccess.cs
@@ -23,10 +23,13 @@
 
 namespace System.Management.Automation.Interpreter
 {
+
+#nullable enable
     internal interface IBoxableInstruction
     {
-        Instruction BoxIfIndexMatches(int index);
+        Instruction? BoxIfIndexMatches(int index);
     }
+#nullable restore
 
     internal abstract class LocalAccessInstruction : Instruction
     {