diff --git a/evm/src/cpu/kernel/tests/hash.rs b/evm/src/cpu/kernel/tests/hash.rs
index 10e3f46a..9b96de91 100644
--- a/evm/src/cpu/kernel/tests/hash.rs
+++ b/evm/src/cpu/kernel/tests/hash.rs
@@ -1,6 +1,6 @@
 use anyhow::Result;
 // use blake2::Blake2b512;
-use ethereum_types::{U256, U512};
+use ethereum_types::U256;
 use rand::{thread_rng, Rng};
 use ripemd::{Digest, Ripemd160};
 use sha2::Sha256;