Issue #18200: Update the stdlib (except tests) to use
ModuleNotFoundError.
diff --git a/Lib/json/decoder.py b/Lib/json/decoder.py
index da7ef9c..4f11354 100644
--- a/Lib/json/decoder.py
+++ b/Lib/json/decoder.py
@@ -5,7 +5,7 @@
 from json import scanner
 try:
     from _json import scanstring as c_scanstring
-except ImportError:
+except ModuleNotFoundError:
     c_scanstring = None
 
 __all__ = ['JSONDecoder']