diff --git a/kernel/src/backtrace.rs b/kernel/src/backtrace.rs
index 0c45cc7..abf95fb 100644
--- a/kernel/src/backtrace.rs
+++ b/kernel/src/backtrace.rs
@@ -1,4 +1,4 @@
-use core::intrinsics::size_of;
+use core::mem::size_of;
 
 extern "C" {
     fn stext();
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index d059360..29e5ce0 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -6,7 +6,6 @@
 #![feature(optin_builtin_traits)]
 #![feature(panic_info_message)]
 #![feature(global_asm)]
-#![feature(core_intrinsics)]
 #![no_std]
 
 // just keep it ...