diff --git a/MdeModulePkg/Library/PiDxeS3BootScriptLib/BootScriptSave.c b/MdeModulePkg/Library/PiDxeS3BootScriptLib/BootScriptSave.c
index 9ff5b80e7a..5698c91663 100644
--- a/MdeModulePkg/Library/PiDxeS3BootScriptLib/BootScriptSave.c
+++ b/MdeModulePkg/Library/PiDxeS3BootScriptLib/BootScriptSave.c
@@ -1672,7 +1672,7 @@ S3BootScriptSaveMemPoll (
   IN  VOID                              *BitMask,
   IN  VOID                              *BitValue,
   IN  UINTN                             Duration,
-  IN  UINTN                             LoopTimes
+  IN  UINT64                            LoopTimes
   )
 {
   UINT8                 Length;
diff --git a/MdePkg/Include/Library/S3BootScriptLib.h b/MdePkg/Include/Library/S3BootScriptLib.h
index 0a8cbe355a..3f43da8794 100644
--- a/MdePkg/Include/Library/S3BootScriptLib.h
+++ b/MdePkg/Include/Library/S3BootScriptLib.h
@@ -343,7 +343,7 @@ S3BootScriptSaveMemPoll (
   IN  VOID                      *BitMask,
   IN  VOID                      *BitValue,
   IN  UINTN                     Duration,
-  IN  UINTN                     LoopTimes
+  IN  UINT64                    LoopTimes
   );
 
 /**
diff --git a/MdePkg/Library/BaseS3BootScriptLibNull/BootScriptLib.c b/MdePkg/Library/BaseS3BootScriptLibNull/BootScriptLib.c
index 373ce6b388..3dee64746a 100644
--- a/MdePkg/Library/BaseS3BootScriptLibNull/BootScriptLib.c
+++ b/MdePkg/Library/BaseS3BootScriptLibNull/BootScriptLib.c
@@ -303,7 +303,7 @@ S3BootScriptSaveMemPoll (
   IN  VOID                              *BitMask,
   IN  VOID                              *BitValue,
   IN  UINTN                             Duration,
-  IN  UINTN                             LoopTimes
+  IN  UINT64                            LoopTimes
   )
 {
 	return RETURN_SUCCESS;