diff --git a/os/src/main.rs b/os/src/main.rs
index e9a34bb85..647f9284a 100644
--- a/os/src/main.rs
+++ b/os/src/main.rs
@@ -3,7 +3,6 @@
 #![feature(global_asm)]
 #![feature(llvm_asm)]
 #![feature(panic_info_message)]
-#![feature(const_in_array_repeat_expressions)]
 #![feature(alloc_error_handler)]
 
 extern crate alloc;
@@ -49,4 +48,4 @@ pub fn rust_main() -> ! {
     task::add_initproc();
     task::run_tasks();
     panic!("Unreachable in rust_main!");
-}
\ No newline at end of file
+}