diff --git a/lib/context.js b/lib/context.js
index 97dac5a..cdaf153 100644
--- a/lib/context.js
+++ b/lib/context.js
@@ -7,7 +7,6 @@
 
 const util = require('util');
 const createError = require('http-errors-lite');
-const httpAssert = require('http-assert');
 const delegate = require('./delegates');
 const statuses = require('./statuses');
 
@@ -59,15 +58,17 @@ const proto = module.exports = {
    *
    *    this.assert(this.user, 401, 'Please login!');
    *
-   * See: https://github.com/jshttp/http-assert
-   *
    * @param {Mixed} test
    * @param {Number} status
    * @param {String} message
    * @api public
    */
 
-  assert: httpAssert,
+  assert: function(test, status, message, props) {
+    if (!test) {
+      this.throw(status, message, props)
+    }
+  },
 
   /**
    * Throw an error with `status` (default 500) and
diff --git a/package.json b/package.json
index 59066bc..de799f9 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,6 @@
     "error-inject": "^1.0.0",
     "escape-html": "^1.0.3",
     "fresh": "~0.5.2",
-    "http-assert": "^1.3.0",
     "http-errors-lite": "^2.0.2",
     "koa-compose": "^4.1.0",
     "koa-is-json": "^1.0.0",