diff --git a/door_pi_control/socket.py b/door_pi_control/socket.py
index 0d2d52d..0bbeb0f 100644
--- a/door_pi_control/socket.py
+++ b/door_pi_control/socket.py
@@ -123,7 +123,7 @@ class DoorControlSocket(util.Loggable):
             self._bell._protocol.send_light_msg()
         elif cmd == 'bell_perma_light':
             self._bell._protocol.doing_light ^= True
-            send("Turning the light on permanently: {self._bell._protocol.doing_light}")
+            send(f"Turning the light on permanently: {self._bell._protocol.doing_light}")
         elif cmd == 'bell_raw':
             if (len(args) % 4) != 0:
                 send(f"Invalid number of bytes: {len(args)}")