diff --git a/qcodes_contrib_drivers/drivers/QDevil/QDAC2.py b/qcodes_contrib_drivers/drivers/QDevil/QDAC2.py
index 5b031427c..9c9ef2fe8 100644
--- a/qcodes_contrib_drivers/drivers/QDevil/QDAC2.py
+++ b/qcodes_contrib_drivers/drivers/QDevil/QDAC2.py
@@ -527,7 +527,7 @@ def __init__(self, channel: 'QDac2Channel'):
     def __enter__(self):
         return self
 
-    def _cleanup(self, wave_kind: str) -> bool:
+    def _cleanup(self, wave_kind: str) -> None:
         if self._trigger:
             self._channel._parent.free_trigger(self._trigger)
         if self._marker_start: