diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index 1f8b04630e2..391e8b04336 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -25,6 +25,7 @@ use std::oldmap::HashMap;
 
 #[auto_encode]
 #[auto_decode]
+#[deriving_eq]
 pub enum binop {
     PLUS,
     MINUS,
@@ -518,12 +519,6 @@ pub fn reserved_keyword_table() -> HashMap<~str, ()> {
     words
 }
 
-impl binop : cmp::Eq {
-    pure fn eq(&self, other: &binop) -> bool {
-        ((*self) as uint) == ((*other) as uint)
-    }
-    pure fn ne(&self, other: &binop) -> bool { !(*self).eq(other) }
-}
 
 impl Token : cmp::Eq {
     pure fn eq(&self, other: &Token) -> bool {