diff --git a/plat/mediatek/mt8188/include/platform_def.h b/plat/mediatek/mt8188/include/platform_def.h
index 7138c7a..43d12da 100644
--- a/plat/mediatek/mt8188/include/platform_def.h
+++ b/plat/mediatek/mt8188/include/platform_def.h
@@ -36,6 +36,7 @@
 #define APU_AO_CTRL		(IO_PHYS + 0x090f2000)
 #define APU_PLL			(IO_PHYS + 0x090f3000)
 #define APU_ACC			(IO_PHYS + 0x090f4000)
+#define APU_SEC_CON		(IO_PHYS + 0x090f5000)
 #define APU_ARETOP_ARE0		(IO_PHYS + 0x090f6000)
 #define APU_ARETOP_ARE1		(IO_PHYS + 0x090f7000)
 #define APU_ARETOP_ARE2		(IO_PHYS + 0x090f8000)