diff --git a/plat/mediatek/mt8173/include/plat_sip_calls.h b/plat/mediatek/mt8173/include/plat_sip_calls.h
index 88202cc..ce9951a 100644
--- a/plat/mediatek/mt8173/include/plat_sip_calls.h
+++ b/plat/mediatek/mt8173/include/plat_sip_calls.h
@@ -10,7 +10,7 @@
 /*******************************************************************************
  * Plat SiP function constants
  ******************************************************************************/
-#define MTK_PLAT_SIP_NUM_CALLS	6
+#define MTK_PLAT_SIP_NUM_CALLS	7
 
 #define MTK_SIP_PWR_ON_MTCMOS			0x82000402
 #define MTK_SIP_PWR_OFF_MTCMOS			0x82000403
@@ -18,5 +18,6 @@
 #define MTK_SIP_SET_HDCP_KEY_NUM		0x82000405
 #define MTK_SIP_CLR_HDCP_KEY			0x82000406
 #define MTK_SIP_SET_HDCP_KEY_EX			0x82000407
+#define MTK_SIP_SMC_WATCHDOG			0x82003D06
 
 #endif /* PLAT_SIP_CALLS_H */