diff --git a/src/librustc_mir/interpret/machine.rs b/src/librustc_mir/interpret/machine.rs
index 5dd33ec551d..4c56f4cbd6a 100644
--- a/src/librustc_mir/interpret/machine.rs
+++ b/src/librustc_mir/interpret/machine.rs
@@ -25,6 +25,7 @@ use super::{
 };
 
 /// Classifying memory accesses
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum MemoryAccess {
     Read,
     Write,