diff --git a/common/Kconfig b/common/Kconfig
index 67b3818..62d78c5 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -403,6 +403,7 @@
 
 config USE_PREBOOT
 	bool "Enable preboot"
+	default "usb start" if USB_KEYBOARD
 	help
 	  When this option is enabled, the existence of the environment
 	  variable "preboot" will be checked immediately before starting the