diff --git a/MdePkg/Include/x64/ProcessorBind.h b/MdePkg/Include/x64/ProcessorBind.h
index 49cb117776..4332b89fff 100644
--- a/MdePkg/Include/x64/ProcessorBind.h
+++ b/MdePkg/Include/x64/ProcessorBind.h
@@ -155,13 +155,13 @@ typedef INT64   INTN;
 //
 // Processor specific defines
 //
-#define MAX_BIT     0x8000000000000000
-#define MAX_2_BITS  0xC000000000000000
+#define MAX_BIT     0x8000000000000000ULL
+#define MAX_2_BITS  0xC000000000000000ULL
 
 //
 // Maximum legal X64 address
 //
-#define MAX_ADDRESS   0xFFFFFFFFFFFFFFFF
+#define MAX_ADDRESS   0xFFFFFFFFFFFFFFFFULL
 
 //
 // The stack alignment required for X64