diff --git a/Cargo.lock b/Cargo.lock
index 5f611e9ee7c..1ad6dcd35fe 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -926,7 +926,6 @@ dependencies = [
  "ordered-float 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugins 0.0.1",
  "range 0.0.1",
- "rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.8.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 0.8.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo-fontconfig 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/components/gfx/Cargo.toml b/components/gfx/Cargo.toml
index d504e0bb138..7ce2bf72546 100644
--- a/components/gfx/Cargo.toml
+++ b/components/gfx/Cargo.toml
@@ -29,7 +29,6 @@ net_traits = {path = "../net_traits"}
 ordered-float = "0.2.2"
 plugins = {path = "../plugins"}
 range = {path = "../range"}
-rustc-serialize = "0.3"
 serde = "0.8"
 servo_atoms = {path = "../atoms"}
 servo_geometry = {path = "../geometry"}
diff --git a/components/gfx/display_list/mod.rs b/components/gfx/display_list/mod.rs
index 3a2178255a9..544a4d4029c 100644
--- a/components/gfx/display_list/mod.rs
+++ b/components/gfx/display_list/mod.rs
@@ -251,7 +251,7 @@ impl<'a> Iterator for DisplayListTraversal<'a> {
 /// Display list sections that make up a stacking context. Each section  here refers
 /// to the steps in CSS 2.1 Appendix E.
 ///
-#[derive(Clone, Copy, Debug, Deserialize, Eq, HeapSizeOf, Ord, PartialEq, PartialOrd, RustcEncodable, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, HeapSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
 pub enum DisplayListSection {
     BackgroundAndBorders,
     BlockBackgroundsAndBorders,
@@ -259,7 +259,7 @@ pub enum DisplayListSection {
     Outlines,
 }
 
-#[derive(Clone, Copy, Debug, Deserialize, Eq, HeapSizeOf, Ord, PartialEq, PartialOrd, RustcEncodable, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, HeapSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
 pub enum StackingContextType {
     Real,
     PseudoPositioned,
diff --git a/components/gfx/lib.rs b/components/gfx/lib.rs
index 2c50b5532c4..e02793c3a32 100644
--- a/components/gfx/lib.rs
+++ b/components/gfx/lib.rs
@@ -58,7 +58,6 @@ extern crate net_traits;
 extern crate ordered_float;
 #[macro_use]
 extern crate range;
-extern crate rustc_serialize;
 extern crate serde;
 #[macro_use]
 extern crate serde_derive;