diff --git a/library/compiler-builtins/libm/src/lib.rs b/library/compiler-builtins/libm/src/lib.rs
index b15857dbe6f6..e9def4940511 100644
--- a/library/compiler-builtins/libm/src/lib.rs
+++ b/library/compiler-builtins/libm/src/lib.rs
@@ -2,7 +2,7 @@
 #![deny(warnings)]
 #![no_std]
 #![cfg_attr(
-    all(target_arch = "wasm32", not(feature = "stable")),
+    all(target_arch = "wasm32", feature = "unstable"),
     feature(core_intrinsics)
 )]