diff --git a/src/main.c b/src/main.c
index cddf139..ddb7343 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1195,6 +1195,7 @@ static void init_defaults(void)
 	btd_opts.avdtp.stream_mode = BT_IO_MODE_BASIC;
 
 	btd_opts.advmon.rssi_sampling_period = 0xFF;
+	btd_opts.csis.encrypt = true;
 }
 
 static void log_handler(const gchar *log_domain, GLogLevelFlags log_level,