diff --git a/ucs-4.0-1/base/univention-python/modules/uldap.py b/ucs-4.0-1/base/univention-python/modules/uldap.py
index 1761cc9..8ae158f 100644
--- a/ucs-4.0-1/base/univention-python/modules/uldap.py
+++ b/ucs-4.0-1/base/univention-python/modules/uldap.py
@@ -593,7 +593,7 @@ def __setstate__(self, dict):
 
 		_d=univention.debug.function('uldap.__setstate__')
 		self.__dict__.update(dict)
-		self.__open()
+		self.__open(self.ca_certfile)
 
 	def _handle_referral(self, exception):
 		# Following referral