diff --git a/src/librustc_mir/interpret/machine.rs b/src/librustc_mir/interpret/machine.rs
index 1242c41a3562..26d526a6f5ff 100644
--- a/src/librustc_mir/interpret/machine.rs
+++ b/src/librustc_mir/interpret/machine.rs
@@ -76,7 +76,7 @@ pub trait Machine<'a, 'mir, 'tcx>: Sized {
     type MemoryExtra: Default;
 
     /// Extra data stored in every allocation.
-    type AllocExtra: AllocationExtra<Self::PointerTag, Self::MemoryExtra>;
+    type AllocExtra: AllocationExtra<Self::PointerTag, Self::MemoryExtra> + 'static;
 
     /// Memory's allocation map
     type MemoryMap: