diff --git a/plat/nvidia/tegra/include/t186/tegra_def.h b/plat/nvidia/tegra/include/t186/tegra_def.h
index ae11d28..6693cb3 100644
--- a/plat/nvidia/tegra/include/t186/tegra_def.h
+++ b/plat/nvidia/tegra/include/t186/tegra_def.h
@@ -237,6 +237,7 @@
  * Tegra micro-seconds timer constants
  ******************************************************************************/
 #define TEGRA_TMRUS_BASE		0x0C2E0000
+#define TEGRA_TMRUS_SIZE		0x1000
 
 /*******************************************************************************
  * Tegra Power Mgmt Controller constants