diff --git a/Lib/doctest.py b/Lib/doctest.py
index 9bae20f..e80e74d 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -2616,7 +2616,7 @@
     testfiles = [arg for arg in sys.argv[1:] if arg and arg[0] != '-']
     if not testfiles:
         name = os.path.basename(sys.argv[0])
-        if '__loader__' in globals() and name.endswith('.py'):  # python -m
+        if '__loader__' in globals():          # python -m
             name, _ = os.path.splitext(name)
         print("usage: {0} [-v] file ...".format(name))
         return 2