diff --git a/target/linux/generic/files/drivers/platform/mikrotik/rb_hardconfig.c b/target/linux/generic/files/drivers/platform/mikrotik/rb_hardconfig.c
index ab78037a03..26218d6a7d 100644
--- a/target/linux/generic/files/drivers/platform/mikrotik/rb_hardconfig.c
+++ b/target/linux/generic/files/drivers/platform/mikrotik/rb_hardconfig.c
@@ -61,6 +61,7 @@
 #define RB_HW_OPT_HAS_VOLTAGE		BIT(1)
 #define RB_HW_OPT_HAS_USB		BIT(2)
 #define RB_HW_OPT_HAS_ATTINY		BIT(3)
+#define RB_HW_OPT_PULSE_DUTY_CYCLE	BIT(9)
 #define RB_HW_OPT_NO_NAND		BIT(14)
 #define RB_HW_OPT_HAS_LCD		BIT(15)
 #define RB_HW_OPT_HAS_POE_OUT		BIT(16)