diff --git a/plat/rockchip/rk3399/include/platform_def.h b/plat/rockchip/rk3399/include/platform_def.h
index 3df2f7d..7139b41 100644
--- a/plat/rockchip/rk3399/include/platform_def.h
+++ b/plat/rockchip/rk3399/include/platform_def.h
@@ -68,7 +68,7 @@
 /*******************************************************************************
  * Platform specific page table and MMU setup constants
  ******************************************************************************/
-#define ADDR_SPACE_SIZE		(1ull << 32)
+#define ADDR_SPACE_SIZE		(1ULL << 32)
 #define MAX_XLAT_TABLES		20
 #define MAX_MMAP_REGIONS	25