diff --git a/user-verifier/src/signer.rs b/user-verifier/src/signer.rs
index 8a37d07..0ccb268 100644
--- a/user-verifier/src/signer.rs
+++ b/user-verifier/src/signer.rs
@@ -118,14 +118,14 @@ mod tests {
             .signing_key
             .verifying_key()
             .verify_digest(
-                Keccak256::new_with_prefix(&hex::decode(&req.data).unwrap()),
+                Keccak256::new_with_prefix(hex::decode(&req.data).unwrap()),
                 &signature,
             )
             .unwrap();
 
         // Recover and verify public key
         let recovered_key = k256::ecdsa::VerifyingKey::recover_from_digest(
-            Keccak256::new_with_prefix(&hex::decode(&req.data).unwrap()),
+            Keccak256::new_with_prefix(hex::decode(&req.data).unwrap()),
             &signature,
             (req.v - 27).try_into().unwrap(),
         )
diff --git a/user-verifier/tests/common.rs b/user-verifier/tests/common.rs
index 7a3e644..75ffdd5 100644
--- a/user-verifier/tests/common.rs
+++ b/user-verifier/tests/common.rs
@@ -137,5 +137,5 @@ pub async fn signed_call<T: web3::Transport, P: contract::tokens::Tokenize + Clo
             caller_secret,
         )
         .await
-        .map_err(|e| contract::Error::Api(e))
+        .map_err(contract::Error::Api)
 }