diff --git a/drivers/net/s2io-regs.h b/drivers/net/s2io-regs.h
index a914fef..518e96d 100644
--- a/drivers/net/s2io-regs.h
+++ b/drivers/net/s2io-regs.h
@@ -300,6 +300,7 @@
 	u64 gpio_control;
 #define GPIO_CTRL_GPIO_0		BIT(8)
 	u64 misc_control;
+#define FAULT_BEHAVIOUR			BIT(0)
 #define EXT_REQ_EN			BIT(1)
 #define MISC_LINK_STABILITY_PRD(val)   vBIT(val,29,3)