diff --git a/bootstrap.py b/bootstrap.py
--- a/bootstrap.py
+++ b/bootstrap.py
@@ -637,20 +637,20 @@ def install_python(home_dir, lib_dir, in
         if sys.platform == 'cygwin' and os.path.exists(executable + '.exe'):
             # Cygwin misreports sys.executable sometimes
             executable += '.exe'
             py_executable += '.exe'
             logger.info('Executable actually exists in %s' % executable)
         shutil.copyfile(executable, py_executable)
         make_exe(py_executable)
         if sys.platform == 'win32' or sys.platform == 'cygwin':
-            pythonw = os.path.join(os.path.dirname(sys.executable, 'pythonw.exe'))
+            pythonw = os.path.join(os.path.dirname(sys.executable), 'pythonw.exe')
             if os.path.exists(pythonw):
                 logger.info('Also created pythonw.exe')
-                shutil.copyfile(pythonw, os.path.join(os.path.dirname(py_executable, 'pythonw.exe')))
+                shutil.copyfile(pythonw, os.path.join(os.path.dirname(py_executable), 'pythonw.exe'))
         if sys.platform == 'darwin':
             # Make sure we use the the embedded interpreter inside
             # the framework, even if sys.executable points to
             # the stub executable in ${sys.prefix}/bin
             shutil.copy(
                     os.path.join(
                         prefix, 'Resources/Python.app/Contents/MacOS/Python'),
                     py_executable)