diff --git a/cli/cli.rs b/cli/cli.rs
index 42b2b29f8a..e5b39c5589 100644
--- a/cli/cli.rs
+++ b/cli/cli.rs
@@ -14,11 +14,6 @@ use deno_core::StartupData;
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
 
-// Buf represents a byte array returned from a "Op". The message might be empty
-// (which will be translated into a null object on the javascript side) or it is
-// a heap allocated opaque sequence of bytes.  Usually a flatbuffer message.
-pub type Buf = Box<[u8]>;
-
 /// Implements deno_core::Behavior for the main Deno command-line.
 pub struct Cli {
   startup_data: Option<StartupData>,
diff --git a/cli/compiler.rs b/cli/compiler.rs
index 2d6e4a4b70..ec02b62f84 100644
--- a/cli/compiler.rs
+++ b/cli/compiler.rs
@@ -1,5 +1,4 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-use crate::cli::Buf;
 use crate::isolate_state::IsolateState;
 use crate::msg;
 use crate::permissions::{DenoPermissions, PermissionAccessor};
@@ -8,6 +7,7 @@ use crate::resources::Resource;
 use crate::resources::ResourceId;
 use crate::startup_data;
 use crate::workers;
+use deno_core::Buf;
 use futures::Future;
 use serde_json;
 use std::str;
diff --git a/cli/isolate_state.rs b/cli/isolate_state.rs
index 4cc0103896..8b7745f9ec 100644
--- a/cli/isolate_state.rs
+++ b/cli/isolate_state.rs
@@ -1,9 +1,9 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-use crate::cli::Buf;
 use crate::deno_dir;
 use crate::flags;
 use crate::global_timer::GlobalTimer;
 use crate::modules::Modules;
+use deno_core::Buf;
 use futures::sync::mpsc as async_mpsc;
 use std;
 use std::env;
diff --git a/cli/ops.rs b/cli/ops.rs
index 254a21563b..862f925602 100644
--- a/cli/ops.rs
+++ b/cli/ops.rs
@@ -1,7 +1,6 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 use atty;
 use crate::ansi;
-use crate::cli::Buf;
 use crate::cli::Cli;
 use crate::errors;
 use crate::errors::{permission_denied, DenoError, DenoResult, ErrorKind};
@@ -21,6 +20,7 @@ use crate::tokio_util;
 use crate::tokio_write;
 use crate::version;
 use deno_core::deno_buf;
+use deno_core::Buf;
 use deno_core::JSError;
 use deno_core::Op;
 use flatbuffers::FlatBufferBuilder;
diff --git a/cli/resources.rs b/cli/resources.rs
index 1540f4ff73..2f07f0f11c 100644
--- a/cli/resources.rs
+++ b/cli/resources.rs
@@ -8,7 +8,6 @@
 // descriptors". This module implements a global resource table. Ops (AKA
 // handlers) look up resources by their integer id here.
 
-use crate::cli::Buf;
 use crate::errors;
 use crate::errors::bad_resource;
 use crate::errors::DenoError;
@@ -17,6 +16,8 @@ use crate::http_body::HttpBody;
 use crate::isolate_state::WorkerChannels;
 use crate::repl::Repl;
 
+use deno_core::Buf;
+
 use futures;
 use futures::Future;
 use futures::Poll;
diff --git a/cli/workers.rs b/cli/workers.rs
index edded77564..a69acd6cce 100644
--- a/cli/workers.rs
+++ b/cli/workers.rs
@@ -1,5 +1,4 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-use crate::cli::Buf;
 use crate::cli::Cli;
 use crate::flags::DenoFlags;
 use crate::isolate::Isolate;
@@ -9,6 +8,7 @@ use crate::js_errors::JSErrorColor;
 use crate::permissions::DenoPermissions;
 use crate::resources;
 use crate::tokio_util;
+use deno_core::Buf;
 use deno_core::JSError;
 use deno_core::StartupData;
 use futures::future::lazy;