diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index 129d47b..9a92c07 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -132,7 +132,7 @@
 	  and AC100/AC200 ICs.
 
 config UNIPHIER_SYSTEM_BUS
-	bool "UniPhier System Bus driver"
+	tristate "UniPhier System Bus driver"
 	depends on ARCH_UNIPHIER && OF
 	default y
 	help