diff --git a/src/libcore/internal_macros.rs b/src/libcore/internal_macros.rs
index 5f578e44323ec..8304a67691853 100644
--- a/src/libcore/internal_macros.rs
+++ b/src/libcore/internal_macros.rs
@@ -118,6 +118,7 @@ macro_rules! impl_fn_for_zst {
     }
 }
 
+#[allow(unused_macros)]
 macro_rules! llvm_asm {
     // Redirect to asm! for stdarch in stable 1.43
     ($($arg:tt)*) => { $crate::asm!($($arg)*) }