diff --git a/tests/run-pass/vec.rs b/tests/run-pass/vec.rs
index c0cf42134527..44e25387fff4 100644
--- a/tests/run-pass/vec.rs
+++ b/tests/run-pass/vec.rs
@@ -1,4 +1,4 @@
-// compile-flags: -Zmiri-tag-raw-pointers
+// compile-flags: -Zmiri-tag-raw-pointers -Zmiri-check-number-validity
 // Gather all references from a mutable iterator and make sure Miri notices if
 // using them is dangerous.
 fn test_all_refs<'a, T: 'a>(dummy: &mut T, iter: impl Iterator<Item = &'a mut T>) {