diff --git a/src/osmo_gsm_tester/bts_nanobts.py b/src/osmo_gsm_tester/bts_nanobts.py
index 7f0151f..a18f205 100644
--- a/src/osmo_gsm_tester/bts_nanobts.py
+++ b/src/osmo_gsm_tester/bts_nanobts.py
@@ -28,13 +28,13 @@
 
 class NanoBts(bts.Bts):
 
-    pwsup_list = []
-    _pcu = None
 ##############
 # PROTECTED
 ##############
     def __init__(self, suite_run, conf):
         super().__init__(suite_run, conf, 'nanobts_%s' % conf.get('label', 'nolabel'), 'nanobts')
+        self.pwsup_list = []
+        self._pcu = None
 
     def _configure(self):
         if self.bsc is None: