diff --git a/MdeModulePkg/Core/Pei/Image/Image.c b/MdeModulePkg/Core/Pei/Image/Image.c
index 75dd9b2a97..5b2a6d0a72 100644
--- a/MdeModulePkg/Core/Pei/Image/Image.c
+++ b/MdeModulePkg/Core/Pei/Image/Image.c
@@ -82,9 +82,9 @@ PeiImageReadForShadow (
   OUT    VOID    *Buffer
   )
 {
-  CHAR8 *Destination8;
-  CHAR8 *Source8;
-  UINTN Length;
+  volatile CHAR8  *Destination8;
+  CHAR8           *Source8;
+  UINTN           Length;
 
   Destination8  = Buffer;
   Source8       = (CHAR8 *) ((UINTN) FileHandle + FileOffset);