diff --git a/build.rs b/build.rs
index ad28533..02c39f8 100644
--- a/build.rs
+++ b/build.rs
@@ -9,7 +9,8 @@ use rustc_version::{version_meta, Channel};
 fn main() {
     // Set cfg flags depending on release channel
     if let Channel::Nightly = version_meta().unwrap().channel {
-        return println!("cargo:rustc-cfg=nightly");
+        // return println!("cargo:rustc-cfg=nightly");
+        println!("cargo:rustc-cfg=nightly");
     }
 
     // for the stable build asm lib
diff --git a/src/detail/x86_64_unix.rs b/src/detail/x86_64_unix.rs
index 47b5060..ec28c6f 100644
--- a/src/detail/x86_64_unix.rs
+++ b/src/detail/x86_64_unix.rs
@@ -2,7 +2,7 @@ use crate::detail::{align_down, mut_offset};
 use crate::reg_context::InitFn;
 use crate::stack::Stack;
 
-#[cfg(not(nightly))]
+// #[cfg(not(nightly))]
 #[link(name = "asm", kind = "static")]
 extern "C" {
     pub fn bootstrap_green_task();
@@ -10,6 +10,7 @@ extern "C" {
     pub fn swap_registers(out_regs: *mut Registers, in_regs: *const Registers);
 }
 
+/*
 #[cfg(nightly)]
 mod asm_impl {
     use super::Registers;
@@ -88,6 +89,7 @@ mod asm_impl {
 }
 #[cfg(nightly)]
 pub use self::asm_impl::*;
+*/
 
 #[repr(C)]
 #[derive(Debug)]
diff --git a/src/detail/x86_64_windows.rs b/src/detail/x86_64_windows.rs
index 1a27855..021ecc1 100644
--- a/src/detail/x86_64_windows.rs
+++ b/src/detail/x86_64_windows.rs
@@ -2,7 +2,7 @@ use crate::detail::{align_down, mut_offset};
 use crate::reg_context::InitFn;
 use crate::stack::Stack;
 
-#[cfg(not(nightly))]
+// #[cfg(not(nightly))]
 #[link(name = "asm", kind = "static")]
 extern "C" {
     pub fn bootstrap_green_task();
@@ -16,6 +16,7 @@ pub fn prefetch(data: *const usize) {
     unsafe { prefetch_asm(data) }
 }
 
+/*
 #[cfg(nightly)]
 mod asm_impl {
     use super::Registers;
@@ -162,9 +163,10 @@ mod asm_impl {
 }
 #[cfg(nightly)]
 pub use self::asm_impl::*;
+*/
 
-#[cfg_attr(nightly, repr(simd))]
-#[cfg_attr(not(nightly), repr(C))]
+// #[cfg_attr(nightly, repr(simd))]
+#[repr(C)]
 #[allow(non_camel_case_types)]
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 struct XMM(u32, u32, u32, u32);
diff --git a/src/lib.rs b/src/lib.rs
index 475f835..fd296ab 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,10 +3,7 @@
 //! Rust generator library
 //!
 
-#![cfg_attr(nightly, feature(llvm_asm))]
-#![cfg_attr(nightly, feature(repr_simd))]
 #![cfg_attr(nightly, feature(core_intrinsics))]
-#![cfg_attr(nightly, feature(naked_functions))]
 #![cfg_attr(nightly, feature(thread_local))]
 #![cfg_attr(test, deny(warnings))]
 #![deny(missing_docs)]