diff --git a/kernel/src/objects/null.rs b/kernel/src/objects/null.rs
index 8b35e07..18491ae 100644
--- a/kernel/src/objects/null.rs
+++ b/kernel/src/objects/null.rs
@@ -14,6 +14,10 @@ impl<'a> NullCap<'a> {
     pub fn mint() -> RawCap {
         RawCap::new(0, 0, PhysAddr(0), ObjectType::Null)
     }
+
+    pub fn override_cap(&self, new: RawCap) {
+        unsafe { self.cte.cap.update(|cap| *cap = new) };
+    }
 }
 
 impl Debug for NullCap<'_> {