diff --git a/Lib/argparse.py b/Lib/argparse.py
index 13af7ac239..ffc27432c2 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1703,7 +1703,8 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
 
         # default setting for prog
         if prog is None:
-            prog = _os.path.basename(_sys.argv[0])
+            prog = _os.path.basename(_sys.argv[0]) if globals().get('__spec__') is None \
+                else 'python -m {}'.format(__spec__.name.partition('.')[0])
 
         self.prog = prog
         self.usage = usage