diff --git a/src/json_aid.rs b/src/json_aid.rs
index a382c61ec..d015bb13c 100644
--- a/src/json_aid.rs
+++ b/src/json_aid.rs
@@ -18,12 +18,7 @@ pub fn bytes_from_json(json: &Json) -> Bytes {
 }
 
 pub fn address_from_json(json: &Json) -> Address {
-	let s = json.as_string().unwrap_or("0000000000000000000000000000000000000000");
-	if s.len() % 2 == 1 {
-		address_from_hex(&("0".to_string() + &(clean(s).to_string()))[..])
-	} else {
-		address_from_hex(clean(s))
-	}
+	From::from(json.as_string().unwrap_or("0000000000000000000000000000000000000000"))
 }
 
 pub fn h256_from_json(json: &Json) -> H256 {
@@ -35,7 +30,7 @@ pub fn h256_from_json(json: &Json) -> H256 {
 	}
 }
 
-pub fn u256_from_hex(s: &str) -> U256 {
+pub fn u256_from_str(s: &str) -> U256 {
 	if s.len() >= 2 && &s[0..2] == "0x" {
 		U256::from_str(&s[2..]).unwrap_or(U256::from(0))
 	} else {
@@ -44,7 +39,7 @@ pub fn u256_from_hex(s: &str) -> U256 {
 }
 
 pub fn u256_from_json(json: &Json) -> U256 {
-	u256_from_hex(json.as_string().unwrap_or(""))
+	u256_from_str(json.as_string().unwrap_or(""))
 }
 
 pub fn usize_from_json(json: &Json) -> usize {