diff --git a/labgrid/util/agents/usb_hid_relay.py b/labgrid/util/agents/usb_hid_relay.py
index bf09a59d8..6b4e74af7 100644
--- a/labgrid/util/agents/usb_hid_relay.py
+++ b/labgrid/util/agents/usb_hid_relay.py
@@ -100,7 +100,11 @@ def set_output(self, number, status):
 
     def get_output(self, number):
         with self._claimed():
-            self._get_output(number)
+            return self._get_output(number)
+
+    def __del__(self):
+        if not self._dev.is_kernel_driver_active(0):
+            self._dev.attach_kernel_driver(0)
 
 
 _relays = {}