diff --git a/lib/context.js b/lib/context.js
index 8d7dfb9..fdcc1e1 100644
--- a/lib/context.js
+++ b/lib/context.js
@@ -3,7 +3,6 @@
  * Module dependencies.
  */
 
-var debug = require('debug')('koa:context');
 var delegate = require('delegates');
 var http = require('http');
 
diff --git a/lib/request.js b/lib/request.js
index 98a6b85..27ad505 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -3,7 +3,6 @@
  * Module dependencies.
  */
 
-var debug = require('debug')('koa:request');
 var qs = require('querystring');
 var typeis = require('type-is');
 var fresh = require('fresh');
diff --git a/lib/response.js b/lib/response.js
index 4e399c6..b5d0dbc 100644
--- a/lib/response.js
+++ b/lib/response.js
@@ -4,7 +4,6 @@
  */
 
 var ensureErrorHandler = require('error-inject');
-var debug = require('debug')('koa:response');
 var escape = require('escape-html');
 var onfinish = require('finished');
 var status = require('statuses');