diff --git a/src/rlp/rlpin.rs b/src/rlp/rlpin.rs
index 2179643d1..821511405 100644
--- a/src/rlp/rlpin.rs
+++ b/src/rlp/rlpin.rs
@@ -133,3 +133,12 @@ impl<'a, 'view> Iterator for RlpIterator<'a, 'view> {
 		result
 	}
 }
+
+#[test]
+fn break_it() {
+	use common::*;
+	let h: Bytes = FromHex::from_hex("f84d0589010efbef67941f79b2a056e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421a0c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470").unwrap();
+	let r: Rlp = Rlp::new(&h);
+	let u: U256 = r.val_at(1);
+	assert_eq!(format!("{}", u), "0x10efbef67941f79b2");
+}
diff --git a/src/uint.rs b/src/uint.rs
index 038c85458..2a18a2fb0 100644
--- a/src/uint.rs
+++ b/src/uint.rs
@@ -597,8 +597,15 @@ macro_rules! construct_uint {
 			fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 				let &$name(ref data) = self;
 				try!(write!(f, "0x"));
+				let mut latch = false;
 				for ch in data.iter().rev() {
-					try!(write!(f, "{:02x}", ch));
+					for x in 0..16 {
+						let ch = ch & (15u64 << ((15 - x) * 4) as u64) >> ((15 - x) * 4) as u64;
+						if !latch { latch = ch != 0 }
+						if latch {
+							try!(write!(f, "{:01x}", ch));
+						}
+					}
 				}
 				Ok(())
 			}
@@ -608,8 +615,15 @@ macro_rules! construct_uint {
 			fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 				let &$name(ref data) = self;
 				try!(write!(f, "0x"));
+				let mut latch = false;
 				for ch in data.iter().rev() {
-					try!(write!(f, "{:02x}", ch));
+					for x in 0..16 {
+						let nibble = (ch & (15u64 << ((15 - x) * 4) as u64)) >> (((15 - x) * 4) as u64);
+						if !latch { latch = nibble != 0 }
+						if latch {
+							try!(write!(f, "{:x}", nibble));
+						}
+					}
 				}
 				Ok(())
 			}