diff --git a/ucs-school-old-homedirs/remove-old-homedirs.py b/ucs-school-old-homedirs/remove-old-homedirs.py
index 31edd55..933e008 100755
--- a/ucs-school-old-homedirs/remove-old-homedirs.py
+++ b/ucs-school-old-homedirs/remove-old-homedirs.py
@@ -29,7 +29,7 @@
 # /usr/share/common-licenses/AGPL-3; if not, see
 # <http://www.gnu.org/licenses/>.
 
-__package__ = ''  # workaround for PEP 366
+from __future__ import absolute_import
 import listener
 import os
 import shutil
@@ -53,6 +53,7 @@
 target_dir = listener.configRegistry.get("ucsschool/listener/oldhomedir/targetdir")
 fs_types = listener.configRegistry.get("ucsschool/listener/oldhomedir/fs_types", DEFAUL_FS).split(":")
 lo = None
+local_ous = []
 
 
 def check_target_dir(dir):
@@ -141,16 +142,12 @@ def warn(msg):
 	)
 
 
-def get_my_ous():
-	"""find out which OUs this host is responsible for, returns list of strings"""
-	return [s.name for s in School.get_all(lo)]
-
-
 def prerun():
-	global lo
+	global lo, local_ous
 	listener.setuid(0)
 	try:
 		lo, po = getMachineConnection(ldap_master=False)
+		local_ous = [s.name for s in School.get_all(lo)]
 	except LDAPError as exc:
 		warn(str(exc))
 		return
@@ -164,12 +161,11 @@ def postrun():
 
 
 def handler(dn, new, old, command):
-	my_ous = set(get_my_ous())
-	users_ous = set(new.get("ucsschoolSchool", []))
+	users_ous = set(new.get("ucsschoolSchool", local_ous))
 
 	if (
 		old and not new and not command == "r" or
-		old and new and command == "m" and my_ous.isdisjoint(users_ous)
+		old and new and command == "m" and local_ous.isdisjoint(users_ous)
 	):
 		uid = old["uid"][0]