diff --git a/src/libunwind/lib.rs b/src/libunwind/lib.rs
index 34ae38d8..8fa5db2b 100644
--- a/src/libunwind/lib.rs
+++ b/src/libunwind/lib.rs
@@ -1,7 +1,7 @@
 #![no_std]
 #![feature(link_cfg)]
 #![feature(nll)]
-#![feature(unwind_attributes)]
+#![feature(c_unwind)]
 #![feature(static_nobundle)]
 #![cfg_attr(not(target_env = "msvc"), feature(libc))]
 
diff --git a/src/libunwind/libunwind.rs b/src/libunwind/libunwind.rs
index 0f0e457e..4ec06264 100644
--- a/src/libunwind/libunwind.rs
+++ b/src/libunwind/libunwind.rs
@@ -77,8 +77,7 @@ pub type _Unwind_Exception_Cleanup_Fn =
     all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
     link(name = "unwind", kind = "static")
 )]
-extern "C" {
-    #[unwind(allowed)]
+extern "C-unwind" {
     pub fn _Unwind_Resume(exception: *mut _Unwind_Exception) -> !;
     pub fn _Unwind_DeleteException(exception: *mut _Unwind_Exception);
     pub fn _Unwind_GetLanguageSpecificData(ctx: *mut _Unwind_Context) -> *mut c_void;
@@ -226,8 +225,7 @@ if #[cfg(not(all(target_os = "ios", target_arch = "arm")))] {
     #[cfg_attr(all(feature = "llvm-libunwind",
                    any(target_os = "fuchsia", target_os = "linux")),
                link(name = "unwind", kind = "static"))]
-    extern "C" {
-        #[unwind(allowed)]
+    extern "C-unwind" {
         pub fn _Unwind_RaiseException(exception: *mut _Unwind_Exception) -> _Unwind_Reason_Code;
         pub fn _Unwind_Backtrace(trace: _Unwind_Trace_Fn,
                                  trace_argument: *mut c_void)
@@ -238,8 +236,7 @@ if #[cfg(not(all(target_os = "ios", target_arch = "arm")))] {
     #[cfg_attr(all(feature = "llvm-libunwind",
                    any(target_os = "fuchsia", target_os = "linux")),
                link(name = "unwind", kind = "static"))]
-    extern "C" {
-        #[unwind(allowed)]
+    extern "C-unwind" {
         pub fn _Unwind_SjLj_RaiseException(e: *mut _Unwind_Exception) -> _Unwind_Reason_Code;
     }