diff --git a/_AutoinstallCreator/test_update.py b/_AutoinstallCreator/test_update.py
index 469e49c4..cb3e662e 100644
--- a/_AutoinstallCreator/test_update.py
+++ b/_AutoinstallCreator/test_update.py
@@ -11,9 +11,11 @@
 _root_path: str = os.path.dirname(_self_path)
 _tools_path: str = os.path.join(_root_path, '.tools')
 
-busybox_exe_path = 'busybox'
+busybox_exe_path: str = 'busybox'
+update_script_name: str = 'update.sh'
 if sys.platform.startswith('win'):
-    busybox_exe_path: str = os.path.join(_tools_path, 'busybox.exe')
+    busybox_exe_path = os.path.join(_tools_path, 'busybox.exe')
+    update_script_name = 'update.bat'
 
 if _root_path not in sys.path:
     sys.path.append(_root_path)
@@ -71,7 +73,7 @@ def test_update_to_new_version(self):
         io_tools.write_text(os.path.join(_self_tmp_path, self.test_old_version, '_AutoinstallCreator', 'version.txt'),
                             self.test_old_version)
 
-        result = subprocess.run([os.path.join(_self_tmp_path, self.test_old_version, 'update.bat')],
+        result = subprocess.run([os.path.join(_self_tmp_path, self.test_old_version, update_script_name)],
                                 env={
                                     **os.environ,
                                     'MOCK_AUTOINSTALLCREATOR_VERSION_BODY': self.version_str,