diff --git a/src/libserialize/serialize.rs b/src/libserialize/serialize.rs
index d005a8ef004..3bed4e4040b 100644
--- a/src/libserialize/serialize.rs
+++ b/src/libserialize/serialize.rs
@@ -16,7 +16,6 @@ Core encoding and decoding interfaces.
 
 use std::path;
 use std::rc::Rc;
-use std::gc::{Gc, GC};
 use std::cell::{Cell, RefCell};
 
 pub trait Encoder<E> {
@@ -392,12 +391,6 @@ impl<E, D:Decoder<E>,T:Decodable<D, E>> Decodable<D, E> for Box<T> {
     }
 }
 
-impl<E, S:Encoder<E>,T:'static + Encodable<S, E>> Encodable<S, E> for Gc<T> {
-    fn encode(&self, s: &mut S) -> Result<(), E> {
-        (**self).encode(s)
-    }
-}
-
 impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for Rc<T> {
     #[inline]
     fn encode(&self, s: &mut S) -> Result<(), E> {
@@ -412,12 +405,6 @@ impl<E, D:Decoder<E>,T:Decodable<D, E>> Decodable<D, E> for Rc<T> {
     }
 }
 
-impl<E, D:Decoder<E>,T:Decodable<D, E> + 'static> Decodable<D, E> for Gc<T> {
-    fn decode(d: &mut D) -> Result<Gc<T>, E> {
-        Ok(box(GC) try!(Decodable::decode(d)))
-    }
-}
-
 impl<'a, E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for &'a [T] {
     fn encode(&self, s: &mut S) -> Result<(), E> {
         s.emit_seq(self.len(), |s| {