diff --git a/setup.cfg b/setup.cfg
index d7f6981..c0f0846 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,6 @@
+[metadata]
+description-file = README.rst
+
 [bdist_wheel]
 universal=1
 
-[metadata]
-description-file = README.rst
diff --git a/tests/io/test_json.py b/tests/io/test_json.py
index 1c4716b..0e3a2f9 100644
--- a/tests/io/test_json.py
+++ b/tests/io/test_json.py
@@ -10,7 +10,7 @@ class ContextMock:
 
 def test_write_json_to_file(tmpdir):
     file = tmpdir.join('output.json')
-    json_writer = to_json(file)
+    json_writer = to_json(str(file))
     context = ContextMock()
 
     get_initializer(json_writer)(context)
@@ -30,7 +30,7 @@ def test_write_json_to_file(tmpdir):
 
 def test_write_json_without_initializer_should_not_work(tmpdir):
     file = tmpdir.join('output.json')
-    json_writer = to_json(file)
+    json_writer = to_json(str(file))
 
     context = ContextMock()
     with pytest.raises(AttributeError):