diff --git a/library/stdarch/crates/core_arch/src/lib.rs b/library/stdarch/crates/core_arch/src/lib.rs
index b0eea598610d..30209f94446d 100644
--- a/library/stdarch/crates/core_arch/src/lib.rs
+++ b/library/stdarch/crates/core_arch/src/lib.rs
@@ -5,7 +5,6 @@
 #![deny(rust_2018_idioms)]
 #![feature(
     asm,
-    const_fn,
     const_fn_union,
     const_fn_transmute,
     custom_inner_attributes,