diff --git a/test/res.append.js b/test/res.append.js
index 325dd4d1..2dd17a3a 100644
--- a/test/res.append.js
+++ b/test/res.append.js
@@ -108,7 +108,7 @@ function shouldHaveHeaderValues (key, values) {
   return function (res) {
     var headers = res.headers[key.toLowerCase()]
     assert.ok(headers, 'should have header "' + key + '"')
-    assert.strictEqual(headers.length, values.length, 'should have ' + values.length + ' occurances of "' + key + '"')
+    assert.strictEqual(headers.length, values.length, 'should have ' + values.length + ' occurrences of "' + key + '"')
     for (var i = 0; i < values.length; i++) {
       assert.strictEqual(headers[i], values[i])
     }