diff --git a/src/platform.rs b/src/platform.rs
index 00058b1..603687d 100644
--- a/src/platform.rs
+++ b/src/platform.rs
@@ -371,6 +371,7 @@ pub fn avx2_detected() -> bool {
 
 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 #[inline(always)]
+#[allow(unreachable_code)]
 pub fn sse41_detected() -> bool {
     // A testing-only short-circuit.
     if cfg!(feature = "no_sse41") {