diff --git a/lib/solaar/ui/window.py b/lib/solaar/ui/window.py
index 11f30fe1..2a1741ac 100644
--- a/lib/solaar/ui/window.py
+++ b/lib/solaar/ui/window.py
@@ -579,7 +579,12 @@ def _update_receiver_panel(receiver, panel, buttons, full=False):
 
 	# b._insecure.set_visible(False)
 	buttons._unpair.set_visible(False)
-	buttons._pair.set_sensitive(devices_count < receiver.max_devices and not is_pairing)
+
+	may_pair = receiver.may_unpair and not is_pairing
+	if may_pair and devices_count >= receiver.max_devices:
+		online_devices = (n for n in range(1, receiver.max_devices) if n in receiver and receiver[n].online)
+		may_pair &= len(online_devices) < receiver.max_devices
+	buttons._pair.set_sensitive(may_pair)
 	buttons._pair.set_visible(True)