diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 8effe182266d..a3875d983b9f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1371,7 +1371,7 @@ config MFD_SC27XX_PMIC
 	  and it also adds the irq_chip parts for handling the PMIC chip events.
 
 config RZ_MTU3
-	bool "Renesas RZ/G2L MTU3a core driver"
+	tristate "Renesas RZ/G2L MTU3a core driver"
 	depends on (ARCH_RZG2L && OF) || COMPILE_TEST
 	help
 	  Select this option to enable Renesas RZ/G2L MTU3a core driver for
diff --git a/drivers/mfd/rz-mtu3.c b/drivers/mfd/rz-mtu3.c
index 04006f4aa702..037956f0254b 100644
--- a/drivers/mfd/rz-mtu3.c
+++ b/drivers/mfd/rz-mtu3.c
@@ -11,6 +11,7 @@
 #include <linux/irq.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/rz-mtu3.h>
+#include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/reset.h>
 #include <linux/spinlock.h>