diff --git a/tests/run-pass/stacked-borrows/2phase.rs b/tests/run-pass/stacked-borrows/2phase.rs
index 97f435472e30..948da140477e 100644
--- a/tests/run-pass/stacked-borrows/2phase.rs
+++ b/tests/run-pass/stacked-borrows/2phase.rs
@@ -1,3 +1,4 @@
+// compile-flags: -Zmiri-tag-raw-pointers
 #![allow(mutable_borrow_reservation_conflict)]
 
 trait S: Sized {