diff -r 314eeb71b161 Lib/test/test_gdb.py
--- a/Lib/test/test_gdb.py	Mon Dec 14 00:22:10 2015 +0100
+++ b/Lib/test/test_gdb.py	Tue Dec 15 21:39:03 2015 +0100
@@ -173,6 +173,7 @@ class DebuggerTests(unittest.TestCase):
         args = ['--eval-command=%s' % cmd for cmd in commands]
         args += ["--args",
                  sys.executable]
+        args.extend(subprocess._args_from_interpreter_flags())
 
         if not import_site:
             # -S suppresses the default 'import site'