diff --git a/Cargo.lock b/Cargo.lock
index a5ae0ff1..693c51c6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -102,7 +102,6 @@ name = "chain"
 version = "0.1.0"
 dependencies = [
  "bitcrypto 0.1.0",
- "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "primitives 0.1.0",
  "rustc-serialize 0.3.21 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -502,7 +501,6 @@ dependencies = [
 name = "primitives"
 version = "0.1.0"
 dependencies = [
- "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/chain/Cargo.toml b/chain/Cargo.toml
index 485af24e..ca16d59f 100644
--- a/chain/Cargo.toml
+++ b/chain/Cargo.toml
@@ -4,7 +4,6 @@ version = "0.1.0"
 authors = ["debris <marek.kotewicz@gmail.com>"]
 
 [dependencies]
-byteorder = "0.5"
 rustc-serialize = "0.3"
 heapsize = "0.3"
 bitcrypto = { path = "../crypto" }
diff --git a/primitives/Cargo.toml b/primitives/Cargo.toml
index c8f33616..faf0e094 100644
--- a/primitives/Cargo.toml
+++ b/primitives/Cargo.toml
@@ -6,7 +6,6 @@ build = "build.rs"
 
 [dependencies]
 heapsize = "0.3"
-byteorder = "0.5"
 rustc-serialize = "0.3"
 
 [build-dependencies]
diff --git a/primitives/src/lib.rs b/primitives/src/lib.rs
index c119fe84..4ddb0c26 100644
--- a/primitives/src/lib.rs
+++ b/primitives/src/lib.rs
@@ -1,6 +1,5 @@
 #![cfg_attr(asm_available, feature(asm))]
 
-extern crate byteorder;
 #[macro_use] extern crate heapsize;
 extern crate rustc_serialize;
 
diff --git a/primitives/src/uint.rs b/primitives/src/uint.rs
index ea0730f5..9ae77bc8 100644
--- a/primitives/src/uint.rs
+++ b/primitives/src/uint.rs
@@ -8,7 +8,6 @@
 use std::{str, fmt};
 use std::ops::{Shr, Shl, BitAnd, BitOr, BitXor, Not, Div, Rem, Mul, Add, Sub};
 use std::cmp::Ordering;
-use byteorder::{WriteBytesExt, LittleEndian, BigEndian};
 use hex::{FromHex, FromHexError};
 
 /// Conversion from decimal string error
@@ -394,28 +393,6 @@ macro_rules! construct_uint {
 				Ok(res)
 			}
 
-			pub fn to_little_endian(&self) -> [u8; $n_words * 8] {
-				let mut result = [0u8; $n_words * 8];
-				{
-					let mut result_ref: &mut [u8] = &mut result;
-					for word in self.0.into_iter() {
-						result_ref.write_u64::<LittleEndian>(*word).expect("sizeof($n_words * u8 * 8) == sizeof($n_words * u64); qed");
-					}
-				}
-				result
-			}
-
-			pub fn to_big_endian(&self) -> [u8; $n_words * 8] {
-				let mut result = [0u8; $n_words * 8];
-				{
-					let mut result_ref: &mut [u8] = &mut result;
-					for word in self.0.into_iter().rev() {
-						result_ref.write_u64::<BigEndian>(*word).expect("sizeof($n_words * u8 * 8) == sizeof($n_words * u64); qed");
-					}
-				}
-				result
-			}
-
 			#[inline]
 			pub fn low_u32(&self) -> u32 {
 				let &$name(ref arr) = self;