diff --git a/src/device/mouse_serial.c b/src/device/mouse_serial.c
index 7505cf3a3..2f933a931 100644
--- a/src/device/mouse_serial.c
+++ b/src/device/mouse_serial.c
@@ -1139,7 +1139,7 @@ static const device_config_t ltsermouse_config[] = {
         .description    = "RTS toggle",
         .type           = CONFIG_BINARY,
         .default_string = NULL,
-        .default_int    = 0,
+        .default_int    = 1,
         .file_filter    = NULL,
         .spinner        = { 0 },
         .selection      = { { 0 } },