diff --git a/src/lib.rs b/src/lib.rs
index 6c8b568..8ce0d4f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -201,29 +201,6 @@ impl Fq2 {
     }
 }
 
-#[cfg(feature = "rustc-serialize")]
-pub trait Group
-    : rustc_serialize::Encodable
-    + rustc_serialize::Decodable
-    + Send
-    + Sync
-    + Copy
-    + Clone
-    + PartialEq
-    + Eq
-    + Sized
-    + Add<Self, Output = Self>
-    + Sub<Self, Output = Self>
-    + Neg<Output = Self>
-    + Mul<Fr, Output = Self> {
-    fn zero() -> Self;
-    fn one() -> Self;
-    fn random<R: Rng>(rng: &mut R) -> Self;
-    fn is_zero(&self) -> bool;
-    fn normalize(&mut self);
-}
-
-#[cfg(not(feature = "rustc-serialize"))]
 pub trait Group
     : Send
     + Sync