diff --git a/spec/normalizeStatusCode.spec.js b/spec/normalizeStatusCode.spec.js
new file mode 100644
index 0000000..1721fe8
--- /dev/null
+++ b/spec/normalizeStatusCode.spec.js
@@ -0,0 +1,23 @@
+'use strict';
+/* eslint-env jasmine */
+
+const normalizeStatusCode = require('../src/normalizeStatusCode');
+
+describe('normalizeStatusCode', () => {
+  it('returns original if disabled in opts', () => {
+    expect(
+     normalizeStatusCode({status_code: 404}, {normalizeStatusCode: false})
+   ).toBe(404);
+  });
+
+  it('returns run callback if configured', () => {
+    expect(
+      normalizeStatusCode(
+        {status_code: 500},
+        {
+          formatStatusCode: res => String(res.status_code).slice(0, -2) + 'xx'
+        }
+      )
+    ).toBe('5xx');
+  });
+});
diff --git a/src/normalizeStatusCode.js b/src/normalizeStatusCode.js
index 166d676..69d0637 100644
--- a/src/normalizeStatusCode.js
+++ b/src/normalizeStatusCode.js
@@ -10,5 +10,5 @@ module.exports = function(res, opts) {
     return opts.formatStatusCode(res, opts);
   }
 
-  return req.status_code;
+  return res.status_code;
 };