diff --git a/library/std/src/sys/thread_local/key/unix.rs b/library/std/src/sys/thread_local/key/unix.rs
index 6661e378dbf4..b4b58b347063 100644
--- a/library/std/src/sys/thread_local/key/unix.rs
+++ b/library/std/src/sys/thread_local/key/unix.rs
@@ -1,7 +1,7 @@
 use crate::mem;
 
 // For WASI add a few symbols not in upstream `libc` just yet.
-#[cfg(target_os = "wasi")]
+#[cfg(all(target_os = "wasi", target_env = "p1", target_feature = "atomics"))]
 mod libc {
     use crate::ffi;