1 files changed, 6 insertions, 5 deletions
diff --git a/src/test/ui/union/union-drop-assign.rs b/src/test/ui/union/union-drop-assign.rs
index c4349c45464..f1511b0a601 100644
--- a/src/test/ui/union/union-drop-assign.rs
+++ b/src/test/ui/union/union-drop-assign.rs
@@ -1,15 +1,16 @@
 // run-pass
 #![allow(unused_assignments)]
-#![allow(unions_with_drop_fields)]
 
 // Drop works for union itself.
 
 #![feature(untagged_unions)]
 
+use std::mem::ManuallyDrop;
+
 struct S;
 
 union U {
-    a: S
+    a: ManuallyDrop<S>
 }
 
 impl Drop for S {
@@ -28,11 +29,11 @@ static mut CHECK: u8 = 0;
 
 fn main() {
     unsafe {
-        let mut u = U { a: S };
+        let mut u = U { a: ManuallyDrop::new(S) };
         assert_eq!(CHECK, 0);
-        u = U { a: S };
+        u = U { a: ManuallyDrop::new(S) };
         assert_eq!(CHECK, 1); // union itself is assigned, union is dropped, field is not dropped
-        u.a = S;
+        *u.a = S;
         assert_eq!(CHECK, 11); // union field is assigned, field is dropped
     }
 }