diff --git a/src/stack/stack_protected.rs b/src/stack/stack_protected.rs
index 5090530..95564a7 100644
--- a/src/stack/stack_protected.rs
+++ b/src/stack/stack_protected.rs
@@ -32,6 +32,7 @@
 
 use std::ptr;
 use std::fmt;
+use std::mem;
 
 use libc;