diff --git a/src/lib.rs b/src/lib.rs
index 971b545..3ea93d6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -21,8 +21,6 @@
 
 #![allow(unstable_features)]
 
-#![feature(alloc)]
-#![feature(core)]
 #![feature(unsafe_no_drop_flag)]
 
 extern crate libc;