$ di ./management/univention-management-console-module-appcenter/umc/python/appcenter/app_center.py
diff --git a/branches/ucs-4.0/ucs-4.0-2/management/univention-management-console-module-appcenter/umc/python/appcenter/app_center.py b/branches/ucs-4.0/ucs-4.0-2/management/univention-management-console-module-appcenter/umc/python/appcenter/app_center.py
index 5e8b079..4bb8d7d 100644
--- a/branches/ucs-4.0/ucs-4.0-2/management/univention-management-console-module-appcenter/umc/python/appcenter/app_center.py
+++ b/branches/ucs-4.0/ucs-4.0-2/management/univention-management-console-module-appcenter/umc/python/appcenter/app_center.py
@@ -1640,7 +1640,7 @@ class Application(object):
                                else:
                                        MODULE.process('Cannot run them without credentials')
                                        return
-                       run_join_scripts = Thread(target=subprocess.call, args=[args], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+                       run_join_scripts = Thread(target=subprocess.call, args=[args], kwargs=dict(stdout=subprocess.PIPE, stderr=subprocess.PIPE))
                        run_join_scripts.start()
                        while run_join_scripts.is_alive():
                                # i did not find anything nearly as efficient as this one