diff --git a/plat/nvidia/tegra/include/t186/tegra_def.h b/plat/nvidia/tegra/include/t186/tegra_def.h
index e0eddfd..a394a72 100644
--- a/plat/nvidia/tegra/include/t186/tegra_def.h
+++ b/plat/nvidia/tegra/include/t186/tegra_def.h
@@ -148,6 +148,9 @@
 #define  SECURE_SCRATCH_RSV11_HI	0x6AC
 #define  SECURE_SCRATCH_RSV53_LO	0x7F8
 #define  SECURE_SCRATCH_RSV53_HI	0x7FC
+#define  SECURE_SCRATCH_RSV54_HI	0x804
+#define  SECURE_SCRATCH_RSV55_LO	0x808
+#define  SECURE_SCRATCH_RSV55_HI	0x80C
 
 /*******************************************************************************
  * Tegra Memory Mapped Control Register Access Bus constants