diff --git a/Cargo.lock b/Cargo.lock
index a98bc1ee49b..226f46d37f5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2147,7 +2147,6 @@ dependencies = [
  "heapsize 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "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 0.8.23 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
diff --git a/components/range/Cargo.toml b/components/range/Cargo.toml
index 36c35d97fdb..d93df765089 100644
--- a/components/range/Cargo.toml
+++ b/components/range/Cargo.toml
@@ -14,6 +14,5 @@ path = "lib.rs"
 heapsize = "0.3.0"
 heapsize_derive = "0.1"
 num-traits = "0.1.32"
-rustc-serialize = "0.3"
 serde = "0.8"
 serde_derive = "0.8"
diff --git a/components/range/lib.rs b/components/range/lib.rs
index ddf2eb6d09d..109b14560b9 100644
--- a/components/range/lib.rs
+++ b/components/range/lib.rs
@@ -9,7 +9,6 @@
 extern crate heapsize;
 #[macro_use] extern crate heapsize_derive;
 extern crate num_traits;
-extern crate rustc_serialize;
 #[macro_use]
 extern crate serde_derive;
 
@@ -145,7 +144,7 @@ macro_rules! int_range_index {
 }
 
 /// A range of indices
-#[derive(Clone, Copy, Deserialize, HeapSizeOf, RustcEncodable, Serialize)]
+#[derive(Clone, Copy, Deserialize, HeapSizeOf, Serialize)]
 pub struct Range<I> {
     begin: I,
     length: I,