diff --git a/pyaml_cs_oa/controlsystem.py b/pyaml_cs_oa/controlsystem.py
index 4cd4c37..d24f55a 100644
--- a/pyaml_cs_oa/controlsystem.py
+++ b/pyaml_cs_oa/controlsystem.py
@@ -136,7 +136,7 @@ def _attach(self, configs: list[ControlSysConfig | None]) -> list[OASignal | Non
 
                 if key not in self._devices:
                     n_conf = dict(sig_cfg) | config
-                    nr = sig_cls(sig_cfg_cls(**n_conf))
+                    nr = sig_cls(**n_conf)
                     nr.build()
                     self._devices[key] = nr