diff --git a/Lib/test/test_json.py b/Lib/test/test_json.py
index 7b8f3de..17ccdee 100644
--- a/Lib/test/test_json.py
+++ b/Lib/test/test_json.py
@@ -11,6 +11,7 @@
 
 def test_main():
     test.test_support.run_unittest(json.tests.test_suite())
+    test.test_support.run_doctest(json)
 
 
 if __name__ == "__main__":