diff --git a/master/buildbot/reporters/stash.py b/master/buildbot/reporters/stash.py
index 402206069d3..78108e4b0b8 100644
--- a/master/buildbot/reporters/stash.py
+++ b/master/buildbot/reporters/stash.py
@@ -48,7 +48,7 @@ def send(self, build):
             body = {'state': status, 'key': build[
                 'builder']['name'], 'url': build['url']}
             stash_uri = self.base_url + sha
-            response = yield self.session.post(stash_uri, body, auth=self.auth)
-            if response.status_code != 200:
+            response = yield self.session.post(stash_uri, json=body, auth=self.auth)
+            if response.status_code != 204:
                 log.msg("%s: unable to upload stash status: %s" %
-                        (response.status, response.content))
+                        (response.status_code, response.content))
diff --git a/master/buildbot/test/unit/test_reporter_stash.py b/master/buildbot/test/unit/test_reporter_stash.py
index b439c277479..12092edf8c7 100644
--- a/master/buildbot/test/unit/test_reporter_stash.py
+++ b/master/buildbot/test/unit/test_reporter_stash.py
@@ -64,11 +64,14 @@ def test_basic(self):
         self.assertEqual(
             self.sp.session.post.mock_calls,
             [call(u'serv/rest/build-status/1.0/commits/d34db33fd43db33f',
-                  {'url': 'http://localhost:8080/#builders/79/builds/0',
-                   'state': 'INPROGRESS', 'key': u'Builder0'}, auth=('username', 'passwd')),
+                  json={'url': 'http://localhost:8080/#builders/79/builds/0',
+                        'state': 'INPROGRESS', 'key': u'Builder0'},
+                  auth=('username', 'passwd')),
              call(u'serv/rest/build-status/1.0/commits/d34db33fd43db33f',
-                  {'url': 'http://localhost:8080/#builders/79/builds/0',
-                   'state': 'SUCCESSFUL', 'key': u'Builder0'}, auth=('username', 'passwd')),
+                  json={'url': 'http://localhost:8080/#builders/79/builds/0',
+                        'state': 'SUCCESSFUL', 'key': u'Builder0'},
+                  auth=('username', 'passwd')),
              call(u'serv/rest/build-status/1.0/commits/d34db33fd43db33f',
-                  {'url': 'http://localhost:8080/#builders/79/builds/0',
-                   'state': 'FAILED', 'key': u'Builder0'}, auth=('username', 'passwd'))])
+                  json={'url': 'http://localhost:8080/#builders/79/builds/0',
+                        'state': 'FAILED', 'key': u'Builder0'},
+                  auth=('username', 'passwd'))])