diff --git a/pandas/tests/extension/json/array.py b/pandas/tests/extension/json/array.py
index b64ddbd6ac84d..94bef0617df3c 100644
--- a/pandas/tests/extension/json/array.py
+++ b/pandas/tests/extension/json/array.py
@@ -16,6 +16,7 @@
 import random
 import string
 import sys
+from typing import Mapping
 
 import numpy as np
 
@@ -27,7 +28,7 @@
 class JSONDtype(ExtensionDtype):
     type = abc.Mapping
     name = "json"
-    na_value = UserDict()
+    na_value = UserDict()  # type: Mapping[type, type]
 
     @classmethod
     def construct_array_type(cls):
diff --git a/setup.cfg b/setup.cfg
index 64494bf84363e..e3add80d5dcdf 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -157,9 +157,6 @@ ignore_errors=True
 [mypy-pandas.tests.extension.decimal.test_decimal]
 ignore_errors=True
 
-[mypy-pandas.tests.extension.json.array]
-ignore_errors=True
-
 [mypy-pandas.tests.extension.json.test_json]
 ignore_errors=True