diff --git a/mypy/stubgen.py b/mypy/stubgen.py
index 452dff5e3465..a8e19f0a940a 100755
--- a/mypy/stubgen.py
+++ b/mypy/stubgen.py
@@ -1646,7 +1646,7 @@ def parse_options(args: List[str]) -> Options:
 
     ns = parser.parse_args(args)
 
-    pyversion = defaults.PYTHON2_VERSION if ns.py2 else defaults.PYTHON3_VERSION
+    pyversion = defaults.PYTHON2_VERSION if ns.py2 else sys.version_info[:2]
     if not ns.interpreter:
         ns.interpreter = sys.executable if pyversion[0] == 3 else default_py2_interpreter()
     if ns.modules + ns.packages and ns.files: