diff --git a/port/stm32-l451-miromico-sx1280/example/gatt_rgb.c b/port/stm32-l451-miromico-sx1280/example/gatt_rgb.c
index fcbf987d8..ece37d858 100644
--- a/port/stm32-l451-miromico-sx1280/example/gatt_rgb.c
+++ b/port/stm32-l451-miromico-sx1280/example/gatt_rgb.c
@@ -65,7 +65,6 @@
 #define HEARTBEAT_BLINK_MS   200
 
 static btstack_timer_source_t heartbeat;
-static btstack_packet_callback_registration_t hci_event_callback_registration;
 
 static bool connected;