diff --git a/hardware_system.py b/hardware_system.py
index 06cf621d58e410c7aad38b45b5878ee2f4d5a3cf..2630cc05a4651ff25c7f9aa22e2046bb4d0a65ea 100644
--- a/hardware_system.py
+++ b/hardware_system.py
@@ -287,6 +287,7 @@ class OhmPiHardware:
                 mux_workers.append(Thread(target=mux.switch, kwargs={'elec_dict': elec_dict}))
             for mux_worker in mux_workers:
                 mux_worker.start()
+            self.exec_logger.debug(f'Waiting: {self.mux_barrier.n_waiting}')
             self.mux_barrier.wait()
             for mux_worker in mux_workers:
                 mux_worker.join()