diff --git a/MdePkg/Include/Common/BaseTypes.h b/MdePkg/Include/Common/BaseTypes.h
index 3935919300..92e9c141f7 100644
--- a/MdePkg/Include/Common/BaseTypes.h
+++ b/MdePkg/Include/Common/BaseTypes.h
@@ -139,7 +139,7 @@ typedef CHAR8 *VA_LIST;
 ///
 ///  ALIGN_POINTER - aligns a pointer to the lowest boundry
 ///
-#define ALIGN_POINTER(p, s) ((VOID *) ((p) + (((s) - ((UINTN) (p))) & ((s) - 1))))
+#define ALIGN_POINTER(p, s) ((VOID *) ((UINTN)(p) + (((s) - ((UINTN) (p))) & ((s) - 1))))
 
 ///
 ///  ALIGN_VARIABLE - aligns a variable up to the next natural boundry for int size of a processor