diff --git a/src/arrayvec.rs b/src/arrayvec.rs
index 0101ce8..393bef9 100644
--- a/src/arrayvec.rs
+++ b/src/arrayvec.rs
@@ -11,7 +11,11 @@ use std::borrow::{Borrow, BorrowMut};
 use std::hash::{Hash, Hasher};
 use std::fmt;
 
-#[cfg(feature="std")]
+// Exclude wasm32v1-none: even when std feature is unified to true by workspace
+// feature resolution, this target forces no_std (see lib.rs cfg_attr). In no_std
+// mode `std` is aliased to `core`, and `core::io` is gated behind the unstable
+// `core_io_borrowed_buf` feature (not stable in Rust 1.88, tracking: #117693).
+#[cfg(all(feature = "std", not(all(target_arch = "wasm32", target_os = "none"))))]
 use std::io;
 
 use std::mem::ManuallyDrop;
@@ -1252,7 +1256,7 @@ impl<T, const CAP: usize> Ord for ArrayVec<T, CAP> where T: Ord {
     }
 }
 
-#[cfg(feature="std")]
+#[cfg(all(feature = "std", not(all(target_arch = "wasm32", target_os = "none"))))]
 /// `Write` appends written data to the end of the vector.
 ///
 /// Requires `features="std"`.