diff --git a/plat/nvidia/tegra/include/t194/tegra_def.h b/plat/nvidia/tegra/include/t194/tegra_def.h
index 6f44da6..2d8b88c 100644
--- a/plat/nvidia/tegra/include/t194/tegra_def.h
+++ b/plat/nvidia/tegra/include/t194/tegra_def.h
@@ -105,6 +105,8 @@
 #define MC_VIDEO_PROTECT_BASE_HI	U(0x978)
 #define MC_VIDEO_PROTECT_BASE_LO	U(0x648)
 #define MC_VIDEO_PROTECT_SIZE_MB	U(0x64c)
+#define MC_VIDEO_PROTECT_REG_CTRL	U(0x650)
+#define MC_VIDEO_PROTECT_WRITE_ACCESS_ENABLED	U(3)
 
 /*
  * Carveout (MC_SECURITY_CARVEOUT24) registers used to clear the