diff --git a/components/style/lib.rs b/components/style/lib.rs
index 7741331ba45..eb83aff1bec 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -5,9 +5,13 @@
 #![feature(plugin)]
 #![feature(int_uint)]
 #![feature(box_syntax)]
+#![feature(core)]
+#![feature(std_misc)]
+#![feature(hash)]
+#![feature(collections)]
+#![feature(rustc_private)]
 
 #![allow(missing_copy_implementations)]
-#![allow(unstable)]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate bitflags;
diff --git a/components/style/stylesheets.rs b/components/style/stylesheets.rs
index 4922ace53e9..4694ecdabd3 100644
--- a/components/style/stylesheets.rs
+++ b/components/style/stylesheets.rs
@@ -61,7 +61,7 @@ pub struct StyleRule {
 
 impl Stylesheet {
     pub fn from_bytes_iter<I: Iterator<Item=Vec<u8>>>(
-            mut input: I, base_url: Url, protocol_encoding_label: Option<&str>,
+            input: I, base_url: Url, protocol_encoding_label: Option<&str>,
             environment_encoding: Option<EncodingRef>, origin: Origin) -> Stylesheet {
         let mut bytes = vec!();
         // TODO: incremental decoding and tokenization/parsing