diff --git a/test/test.js b/test/test.js
index 98c7141289c0e87c780c040400d9ad0f84ccb4d9..af38f6b9d5e5c8284d238a1abcf3be4bde13a989 100644
--- a/test/test.js
+++ b/test/test.js
@@ -123,10 +123,10 @@ asyncTest('post sends encoded body', 2, function() {
 asyncTest('post sets content-type header', 1, function() {
   fetch('/request', {
     method: 'post',
-    body: {}
+    body: new FormData()
   }).then(function(response) {
     var request = JSON.parse(response.body);
-    equal(request.headers['content-type'], 'application/x-www-form-urlencoded; charset=UTF-8')
+    ok(/^multipart\/form-data;/.test(request.headers['content-type']))
     start()
   })
 })