diff --git a/crate/memory/src/lib.rs b/crate/memory/src/lib.rs
index ac956fa..96d3fd1 100644
--- a/crate/memory/src/lib.rs
+++ b/crate/memory/src/lib.rs
@@ -1,7 +1,6 @@
 #![cfg_attr(not(test), no_std)]
 #![feature(alloc)]
 #![feature(nll)]
-#![feature(extern_crate_item_prelude)]
 
 // import macros from log
 use log::*;
@@ -14,4 +13,4 @@ pub mod memory_set;
 mod addr;
 pub mod no_mmu;
 
-pub use crate::addr::*;
\ No newline at end of file
+pub use crate::addr::*;
diff --git a/crate/process/src/lib.rs b/crate/process/src/lib.rs
index ac55f7e..764cdb6 100644
--- a/crate/process/src/lib.rs
+++ b/crate/process/src/lib.rs
@@ -6,7 +6,6 @@
 #![feature(vec_resize_default)]
 #![feature(asm)]
 #![feature(exact_size_is_empty)]
-#![feature(extern_crate_item_prelude)]
 
 extern crate alloc;
 
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index b8b1168..6513ac9 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -5,7 +5,6 @@
 #![feature(optin_builtin_traits)]
 #![feature(panic_info_message)]
 #![feature(global_asm)]
-#![feature(extern_crate_item_prelude)]
 #![no_std]
 
 // just keep it ...