diff --git a/include/hardware/bt_gatt_server.h b/include/hardware/bt_gatt_server.h
index 0a5b23b..1a5a400 100644
--- a/include/hardware/bt_gatt_server.h
+++ b/include/hardware/bt_gatt_server.h
@@ -48,7 +48,7 @@
                 bt_uuid_t *app_uuid);
 
 /** Callback indicating that a remote device has connected or been disconnected */
-typedef void (*connection_callback)(int conn_id, int connected,
+typedef void (*connection_callback)(int conn_id, int server_if, int connected,
                                     bt_bdaddr_t *bda);
 
 /** Callback invoked in response to create_service */