diff --git a/src/libcore/tests/manually_drop.rs b/src/libcore/tests/manually_drop.rs
index b8826ad408761..82dfb8d4c0b2a 100644
--- a/src/libcore/tests/manually_drop.rs
+++ b/src/libcore/tests/manually_drop.rs
@@ -23,6 +23,7 @@ fn smoke() {
     drop(x);
 
     // also test unsizing
-    let x : Box<ManuallyDrop<[TypeWithDrop]>> = Box::new(ManuallyDrop::new([TypeWithDrop]));
+    let x : Box<ManuallyDrop<[TypeWithDrop]>> =
+        Box::new(ManuallyDrop::new([TypeWithDrop, TypeWithDrop]));
     drop(x);
 }