diff --git a/MdePkg/Library/BaseLib/Synchronization.c b/MdePkg/Library/BaseLib/Synchronization.c
index a4aa3fb1eb..225453149d 100644
--- a/MdePkg/Library/BaseLib/Synchronization.c
+++ b/MdePkg/Library/BaseLib/Synchronization.c
@@ -16,8 +16,8 @@
 
 #include "BaseLibInternals.h"
 
-#define SPIN_LOCK_RELEASED          ((SPIN_LOCK)1)
-#define SPIN_LOCK_ACQUIRED          ((SPIN_LOCK)2)
+#define SPIN_LOCK_RELEASED          ((UINTN) 1)
+#define SPIN_LOCK_ACQUIRED          ((UINTN) 2)
 
 /**
   Retrieves the architecture specific spin lock alignment requirements for