diff --git a/Cargo.toml b/Cargo.toml
index 2bfe591..60208d5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "heapsize"
-version = "0.1.1"
+version = "0.1.2"
 authors = [ "The Servo Project Developers" ]
 description = "Infrastructure for measuring the total runtime size of an object on the heap"
 license = "MPL-2.0"
@@ -11,4 +11,3 @@ unstable = []
 
 [dependencies]
 libc = "0.1"
-
diff --git a/src/lib.rs b/src/lib.rs
index 12f9c46..5931e17 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,6 +17,7 @@ use std::collections::hash_state;
 use std::hash::Hash;
 use std::marker::PhantomData;
 use std::mem::{size_of, transmute};
+use std::net::{Ipv4Addr, Ipv6Addr};
 use std::sync::Arc;
 use std::rc::Rc;
 
@@ -258,4 +259,5 @@ macro_rules! known_heap_size(
 known_heap_size!(0, u8, u16, u32, u64, usize);
 known_heap_size!(0, i8, i16, i32, i64, isize);
 known_heap_size!(0, bool, f32, f64);
+known_heap_size!(0, Ipv4Addr, Ipv6Addr);
 known_heap_size!(0, PhantomData<T>);