diff --git a/keychain/src/keychain.rs b/keychain/src/keychain.rs
index 6a63c58ef..4dbfa221d 100644
--- a/keychain/src/keychain.rs
+++ b/keychain/src/keychain.rs
@@ -1009,7 +1009,7 @@ mod test {
 		let keychain = Keychain::from_random_seed().unwrap();
 		let key_id = keychain.derive_key_id(1).unwrap();
 		let commit = keychain.commit(5, &key_id).unwrap();
-		let mut msg = ProofMessage::from_bytes(&[0u8; 64]);
+		let msg = ProofMessage::from_bytes(&[0u8; 64]);
 		let extra_data = [99u8; 64];
 
 		let proof = keychain
@@ -1062,7 +1062,7 @@ mod test {
 		// cannot rewind with wrong extra committed data
 		let commit3 = keychain.commit(4, &key_id).unwrap();
 		let wrong_extra_data = [98u8; 64];
-		let should_err = keychain
+		let _should_err = keychain
 			.rewind_range_proof(
 				&key_id,
 				commit3,
diff --git a/util/src/logger.rs b/util/src/logger.rs
index 74877aa9d..1c2292cc4 100644
--- a/util/src/logger.rs
+++ b/util/src/logger.rs
@@ -134,7 +134,7 @@ fn send_panic_to_log() {
 			Some(location) => {
 				error!(
 					LOGGER,
-					"thread '{}' panicked at '{}': {}:{}{:?}",
+					"\nthread '{}' panicked at '{}': {}:{}{:?}\n\n",
 					thread,
 					msg,
 					location.file(),
diff --git a/util/tests/zip.rs b/util/tests/zip.rs
index 81a760347..035292b46 100644
--- a/util/tests/zip.rs
+++ b/util/tests/zip.rs
@@ -29,7 +29,7 @@ fn zip_unzip() {
 
 	let zip_file = File::create(zip_name).unwrap();
 	zip::compress(&root.join("./to_zip"), &zip_file).unwrap();
-	zip_file.sync_all();
+	zip_file.sync_all().unwrap();
 
 	let zip_path = Path::new(zip_name);
 	assert!(zip_path.exists());