diff --git a/src/libcore/str.rs b/src/libcore/str.rs
index f93a5cb4255..f5e0771b7cd 100644
--- a/src/libcore/str.rs
+++ b/src/libcore/str.rs
@@ -98,7 +98,9 @@ export
    escape_char,
    as_buf,
    //buf,
-   sbuf;
+   sbuf,
+
+   unsafe;