diff --git a/lib/logitech_receiver/base_usb.py b/lib/logitech_receiver/base_usb.py
index 513173da..acc2d631 100644
--- a/lib/logitech_receiver/base_usb.py
+++ b/lib/logitech_receiver/base_usb.py
@@ -123,7 +123,7 @@ def _lightspeed_receiver(product_id: int) -> dict:
         "usb_interface": 2,
         "receiver_kind": "lightspeed",
         "name": _("Lightspeed Receiver"),
-        "may_unpair": False,
+        "may_unpair": True,
         "re_pairs": True,
     }
 
diff --git a/lib/solaar/ui/action.py b/lib/solaar/ui/action.py
index 58f6dc1a..6751f92b 100644
--- a/lib/solaar/ui/action.py
+++ b/lib/solaar/ui/action.py
@@ -98,6 +98,10 @@ def unpair(window, device):
         device_number = device.number
 
         try:
-            del receiver[device_number]
+            # force=True ensures the unpair register write is issued even on
+            # re_pairs receivers (Lightspeed, Nano); otherwise _unpair_device
+            # short-circuits to cache-invalidation only and the slot stays
+            # bound on the hardware.
+            receiver._unpair_device(device_number, True)
         except Exception:
             common.error_dialog(common.ErrorReason.UNPAIR, device)