diff --git a/django/test/client.py b/django/test/client.py
index 05d3d78603..d04a718b88 100644
--- a/django/test/client.py
+++ b/django/test/client.py
@@ -35,7 +35,7 @@ BOUNDARY = 'BoUnDaRyStRiNg'
 MULTIPART_CONTENT = 'multipart/form-data; boundary=%s' % BOUNDARY
 CONTENT_TYPE_RE = re.compile(r'.*; charset=([\w\d-]+);?')
 # JSON Vendor Tree spec: https://tools.ietf.org/html/rfc6838#section-3.2
-JSON_CONTENT_TYPE_RE = re.compile(r'^application\/(vnd\..+\+)?json$')
+JSON_CONTENT_TYPE_RE = re.compile(r'^application\/(vnd\..+\+)?json')
 
 
 class RedirectCycleError(Exception):
diff --git a/tests/test_client_regress/tests.py b/tests/test_client_regress/tests.py
index c21fd8651f..9ed2741f47 100644
--- a/tests/test_client_regress/tests.py
+++ b/tests/test_client_regress/tests.py
@@ -1219,7 +1219,12 @@ class RequestMethodStringDataTests(SimpleTestCase):
         self.assertEqual(response.json(), {'key': 'value'})
 
     def test_json_vendor(self):
-        for content_type in ('application/vnd.api+json', 'application/vnd.api.foo+json'):
+        valid_types = (
+            'application/vnd.api+json',
+            'application/vnd.api.foo+json',
+            'application/json; charset=utf-8',
+        )
+        for content_type in valid_types:
             response = self.client.get('/json_response/', {'content_type': content_type})
             self.assertEqual(response['Content-Type'], content_type)
             self.assertEqual(response.json(), {'key': 'value'})