diff --git a/crates/eth2-hashing/src/lib.rs b/crates/eth2-hashing/src/lib.rs
index dc1c48c9..015d0a38 100644
--- a/crates/eth2-hashing/src/lib.rs
+++ b/crates/eth2-hashing/src/lib.rs
@@ -9,7 +9,7 @@
 
 // Ensure we're `no_std` when compiling for Wasm.
 #![cfg_attr(not(feature = "std"), no_std)]
-#[allow(unused_imports)]
+#![allow(unused_imports)]
 
 extern crate alloc;
 use alloc::{vec, vec::Vec};