diff --git a/src/test/run-pass/align-struct.rs b/src/test/run-pass/align-struct.rs
index 19c4c643552e..59d053991673 100644
--- a/src/test/run-pass/align-struct.rs
+++ b/src/test/run-pass/align-struct.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 #![feature(attr_literals)]
 #![feature(repr_align)]
+#![feature(box_syntax)]
 
 use std::mem;
 
@@ -201,13 +202,14 @@ pub fn main() {
     assert_eq!(mem::size_of_val(&a), 16);
     assert!(is_aligned_to(&a, 16));
 
-    let mut arr = [0; 0x10000];
-    arr[0] = 132;
-    let large = AlignLarge {
-        stuff: arr,
+    let mut large = box AlignLarge {
+        stuff: [0; 0x10000],
     };
+    large.stuff[0] = 132;
+    *large.stuff.last_mut().unwrap() = 102;
     assert_eq!(large.stuff[0], 132);
+    assert_eq!(large.stuff.last(), Some(&102));
     assert_eq!(mem::align_of::<AlignLarge>(), 0x10000);
-    assert_eq!(mem::align_of_val(&large), 0x10000);
-    assert!(is_aligned_to(&large, 0x10000));
+    assert_eq!(mem::align_of_val(&*large), 0x10000);
+    assert!(is_aligned_to(&*large, 0x10000));
 }