diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 9aa61c93d7bc..ec284aceb909 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -334,7 +334,7 @@ config SERIAL_MAX310X
 	  Say Y here if you want to support this ICs.
 
 config SERIAL_DZ
-	bool "DECstation DZ serial driver"
+	tristate "DECstation DZ serial driver"
 	depends on MACH_DECSTATION && 32BIT
 	select SERIAL_CORE
 	default y