diff --git a/components/range/Cargo.toml b/components/range/Cargo.toml
index d9f958149ef..3ac67f10338 100644
--- a/components/range/Cargo.toml
+++ b/components/range/Cargo.toml
@@ -12,7 +12,7 @@ path = "lib.rs"
 [dependencies]
 heapsize = "0.3.0"
 heapsize_plugin = "0.1.2"
-num = "0.1.24"
+num-traits = "0.1.32"
 rustc-serialize = "0.3"
 serde = "0.7"
 serde_macros = "0.7"
diff --git a/components/range/lib.rs b/components/range/lib.rs
index b598f638d09..d32909c0808 100644
--- a/components/range/lib.rs
+++ b/components/range/lib.rs
@@ -13,7 +13,7 @@
 #![deny(unsafe_code)]
 
 extern crate heapsize;
-extern crate num as num_lib;
+extern crate num_traits;
 extern crate rustc_serialize;
 extern crate serde;
 
@@ -43,7 +43,7 @@ impl Int for isize {
     #[inline]
     fn max_value() -> isize { ::std::isize::MAX }
     #[inline]
-    fn from_usize(n: usize) -> Option<isize> { num_lib::NumCast::from(n) }
+    fn from_usize(n: usize) -> Option<isize> { num_traits::NumCast::from(n) }
 }
 impl Int for usize {
     #[inline]
diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index 467d0166953..7e1307c2a15 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -1683,7 +1683,7 @@ version = "0.0.1"
 dependencies = [
  "heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ports/cef/Cargo.lock b/ports/cef/Cargo.lock
index eac929d3b8a..32d99033488 100644
--- a/ports/cef/Cargo.lock
+++ b/ports/cef/Cargo.lock
@@ -1559,7 +1559,7 @@ version = "0.0.1"
 dependencies = [
  "heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ports/gonk/Cargo.lock b/ports/gonk/Cargo.lock
index 21ad4a8fc57..3740ef54a77 100644
--- a/ports/gonk/Cargo.lock
+++ b/ports/gonk/Cargo.lock
@@ -1541,7 +1541,7 @@ version = "0.0.1"
 dependencies = [
  "heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",