diff --git a/src/lib.rs b/src/lib.rs
index 1a7d873fe..4bc47e61c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 #![feature(op_assign_traits)]
+#![feature(augmented_assignments)]
 #![feature(associated_consts)]
 #![feature(wrapping)]
 //! Ethcore-util library
diff --git a/src/network/host.rs b/src/network/host.rs
index 32ac713ef..90cbfdaad 100644
--- a/src/network/host.rs
+++ b/src/network/host.rs
@@ -567,7 +567,7 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 		self.add_node("enode://de471bccee3d042261d52e9bff31458daecc406142b401d4cd848f677479f73104b9fdeb090af9583d3391b7f10cb2ba9e26865dd5fca4fcdc0fb1e3b723c786@54.94.239.50:30303");  // BR
 		self.add_node("enode://1118980bf48b0a3640bdba04e0fe78b1add18e1cd99bf22d53daac1fd9972ad650df52176e7c7d89d1114cfef2bc23a2959aa54998a46afcf7d91809f0855082@52.74.57.123:30303");  // SG
 		// ETH/DEV cpp-ethereum (poc-9.ethdev.com)
- 		self.add_node("enode://979b7fa28feeb35a4741660a16076f1943202cb72b6af70d327f053e248bab9ba81760f39d0701ef1d8f89cc1fbd2cacba0710a12cd5314d5e0c9021aa3637f9@5.1.83.226:30303");
+		self.add_node("enode://979b7fa28feeb35a4741660a16076f1943202cb72b6af70d327f053e248bab9ba81760f39d0701ef1d8f89cc1fbd2cacba0710a12cd5314d5e0c9021aa3637f9@5.1.83.226:30303");
 	}
 
 	fn stream_hup<'s>(&'s mut self, io: &mut IoContext<'s, NetworkIoMessage<Message>>, stream: StreamToken) {
diff --git a/src/tinykeccak.c b/src/tinykeccak.c
index ddc3f5be2..466838913 100644
--- a/src/tinykeccak.c
+++ b/src/tinykeccak.c
@@ -1,6 +1,4 @@
 #include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 
 /** libkeccak-tiny
diff --git a/src/uint.rs b/src/uint.rs
index 5073747eb..89834a85a 100644
--- a/src/uint.rs
+++ b/src/uint.rs
@@ -474,6 +474,38 @@ macro_rules! construct_uint {
 			}
 		}
 
+		// TODO: optimise and traitify.
+
+		impl<'a> AddAssign<&'a $name> for $name {
+			fn add_assign(&mut self, other: &'a Self) {
+				*self = self.add(*other);
+			}
+		}
+
+		impl<'a> SubAssign<&'a $name> for $name {
+			fn sub_assign(&mut self, other: &'a Self) {
+				*self = self.sub(*other);
+			}
+		}
+
+		impl<'a> MulAssign<&'a $name> for $name {
+			fn mul_assign(&mut self, other: &'a Self) {
+				*self = self.mul(*other);
+			}
+		}
+
+		impl<'a> DivAssign<&'a $name> for $name {
+			fn div_assign(&mut self, other: &'a Self) {
+				*self = self.div(*other);
+			}
+		}
+
+		impl<'a> RemAssign<&'a $name> for $name {
+			fn rem_assign(&mut self, other: &'a Self) {
+				*self = self.rem(*other);
+			}
+		}
+
 		impl BitAnd<$name> for $name {
 			type Output = $name;