diff --git a/src/mock.rs b/src/mock.rs
index 39c0312a..57830a90 100644
--- a/src/mock.rs
+++ b/src/mock.rs
@@ -87,9 +87,6 @@ impl<T> AsyncIo<T> {
 }
 
 impl AsyncIo<Buf> {
-    #[cfg(feature = "tokio-proto")]
-    //TODO: fix proto::conn::tests to not use tokio-proto API,
-    //and then this cfg flag go away
     pub fn new_buf<T: Into<Vec<u8>>>(buf: T, bytes: usize) -> AsyncIo<Buf> {
         AsyncIo::new(Buf::wrap(buf.into()), bytes)
     }