diff --git a/src/test/ui/drop/drop_order.rs b/src/test/ui/drop/drop_order.rs
index bf740b6a9ab67..ba1ac53aa7ce8 100644
--- a/src/test/ui/drop/drop_order.rs
+++ b/src/test/ui/drop/drop_order.rs
@@ -1,4 +1,5 @@
 // run-pass
+// compile-flags: -Z validate-mir
 #![feature(let_chains)]
 
 use std::cell::RefCell;