diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index 28d1ef39d46..1a5f05e30b9 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -2135,8 +2135,9 @@ class TestParentParsers(TestCase):
         parents = [self.abcd_parent, self.wxyz_parent]
         parser = ErrorRaisingArgumentParser(parents=parents)
         parser_help = parser.format_help()
+        progname = self.main_program
         self.assertEqual(parser_help, textwrap.dedent('''\
-            usage: {} [-h] [-b B] [--d D] [--w W] [-y Y] a z
+            usage: {}{}[-h] [-b B] [--d D] [--w W] [-y Y] a z
 
             positional arguments:
               a
@@ -2152,7 +2153,7 @@ class TestParentParsers(TestCase):
 
             x:
               -y Y
-        '''.format(self.main_program)))
+        '''.format(progname, ' ' if progname else '' )))
 
     def test_groups_parents(self):
         parent = ErrorRaisingArgumentParser(add_help=False)
@@ -2168,8 +2169,9 @@ class TestParentParsers(TestCase):
             ['-y', 'Y', '-z', 'Z'])
 
         parser_help = parser.format_help()
+        progname = self.main_program
         self.assertEqual(parser_help, textwrap.dedent('''\
-            usage: {} [-h] [-w W] [-x X] [-y Y | -z Z]
+            usage: {}{}[-h] [-w W] [-x X] [-y Y | -z Z]
 
             optional arguments:
               -h, --help  show this help message and exit
@@ -2181,7 +2183,7 @@ class TestParentParsers(TestCase):
 
               -w W
               -x X
-        '''.format(self.main_program)))
+        '''.format(progname, ' ' if progname else '' )))
 
 # ==============================
 # Mutually exclusive group tests