diff --git a/tests/test_requests.py b/tests/test_requests.py
index 427675d5..f5f233f7 100755
--- a/tests/test_requests.py
+++ b/tests/test_requests.py
@@ -1523,7 +1523,7 @@ def test_json_encodes_as_bytes():
     p.prepare(
         method='GET',
         url='https://www.example.com/',
-        json='body'
+        json=body
     )
     assert isinstance(p.body, bytes)