diff --git a/csaxs_bec/devices/epics/mcs_card/mcs_card_csaxs.py b/csaxs_bec/devices/epics/mcs_card/mcs_card_csaxs.py
index 8e806d1..feb83d2 100644
--- a/csaxs_bec/devices/epics/mcs_card/mcs_card_csaxs.py
+++ b/csaxs_bec/devices/epics/mcs_card/mcs_card_csaxs.py
@@ -494,7 +494,7 @@ class MCSCardCSAXS(PSIDeviceBase, MCSCard):
     def on_complete(self) -> CompareStatus:
         """On scan completion."""
         # Check Acquiring is DONE
-        status_data_sent = self.task_handler.submit_task(self._check_data_sent, task_args=(5.0))
+        status_data_sent = self.task_handler.submit_task(self._check_data_sent, task_args=(5.0,))
         status = CompareStatus(self.acquiring, ACQUIRING.DONE)
         ret_status = status & status_data_sent
         self.cancel_on_stop(ret_status)