diff --git a/src/rstd.rs b/src/rstd.rs
index 15c22c4..6d9e498 100644
--- a/src/rstd.rs
+++ b/src/rstd.rs
@@ -31,10 +31,6 @@ impl Display for Address {
 /// Extension trait for [Serializable]s.
 pub trait SerializableExt: Serializable {
     /// Serialize into a [Vec] of bytes.
-    fn bytes(&self) -> Vec<u8>;
-}
-
-impl<S: Serializable> SerializableExt for S {
     fn bytes(&self) -> Vec<u8> {
         let mut vec = Vec::new();
         self.serialize(&mut vec);
@@ -42,6 +38,8 @@ impl<S: Serializable> SerializableExt for S {
     }
 }
 
+impl<S: Serializable> SerializableExt for S {}
+
 /// [`ResolverExt::into_rc`].
 pub trait ResolverExt<'a, Ctx: Context<'a>>: Resolver<'a, Ctx> {
     /// Wrap the resolver into [`Arc`].