diff --git a/util/src/hash.rs b/util/src/hash.rs
index ba96f812c..1a16cefa4 100644
--- a/util/src/hash.rs
+++ b/util/src/hash.rs
@@ -718,7 +718,7 @@ mod tests {
 
 	#[test]
 	fn from_and_to_u256() {
-		let u: U256 = x!(0x123456789abcdef0u64);
+		let u: U256 = 0x123456789abcdef0u64.into();
 		let h = H256::from(u);
 		assert_eq!(H256::from(u), H256::from("000000000000000000000000000000000000000000000000123456789abcdef0"));
 		let h_ref = H256::from(&u);
diff --git a/util/src/json_aid.rs b/util/src/json_aid.rs
index 6aed7f09c..7bf940b99 100644
--- a/util/src/json_aid.rs
+++ b/util/src/json_aid.rs
@@ -48,7 +48,7 @@ impl FromJson for Bytes {
 impl FromJson for BTreeMap<H256, H256> {
 	fn from_json(json: &Json) -> Self {
 		match *json {
-			Json::Object(ref o) => o.iter().map(|(key, value)| (x!(&u256_from_str(key)), x!(&U256::from_json(value)))).collect(),
+			Json::Object(ref o) => o.iter().map(|(key, value)| (u256_from_str(key).into(), U256::from_json(value).into())).collect(),
 			_ => BTreeMap::new(),
 		}
 	}
diff --git a/util/src/keys/store.rs b/util/src/keys/store.rs
index 3ecabc07c..296f7ad37 100644
--- a/util/src/keys/store.rs
+++ b/util/src/keys/store.rs
@@ -554,7 +554,7 @@ mod tests {
 						H256::from_str("517ead924a9d0dc3124507e3393d175ce3ff7c1e96529c6c555ce9e51205e9b2").unwrap(),
 						262144,
 						32));
-			key_file.account = Some(x!(i as u64));
+			key_file.account = Some((i as u64).into());
 			result.push(key_file.id.clone());
 			write_sstore.import_key(key_file).unwrap();
 		}