diff --git a/library/stdarch/crates/core_arch/src/lib.rs b/library/stdarch/crates/core_arch/src/lib.rs
index da5b4713aa78..1dca16280c3a 100644
--- a/library/stdarch/crates/core_arch/src/lib.rs
+++ b/library/stdarch/crates/core_arch/src/lib.rs
@@ -5,8 +5,6 @@
 #![deny(rust_2018_idioms)]
 #![feature(
     asm,
-    const_fn_union,
-    const_fn_transmute,
     const_panic,
     custom_inner_attributes,
     link_llvm_intrinsics,