diff --git a/pytec/pytec/gui/view/ctrl_panel.py b/pytec/pytec/gui/view/ctrl_panel.py
index d63bf48..0db1643 100644
--- a/pytec/pytec/gui/view/ctrl_panel.py
+++ b/pytec/pytec/gui/view/ctrl_panel.py
@@ -46,8 +46,6 @@ registerParameterType("mutex", MutexParameter)
 
 
 class CtrlPanel(QObject):
-    set_zero_limits_warning_sig = pyqtSignal(list)
-
     def __init__(
         self,
         thermostat,