diff --git a/plat/mediatek/mt6795/include/platform_def.h b/plat/mediatek/mt6795/include/platform_def.h
index cb06fea..6c64ba5 100644
--- a/plat/mediatek/mt6795/include/platform_def.h
+++ b/plat/mediatek/mt6795/include/platform_def.h
@@ -196,7 +196,7 @@
 /*******************************************************************************
  * Platform specific page table and MMU setup constants
  ******************************************************************************/
-#define ADDR_SPACE_SIZE   (1ull << 32)
+#define ADDR_SPACE_SIZE   (1ULL << 32)
 #define MAX_XLAT_TABLES   7
 #define MAX_MMAP_REGIONS  16