diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
index 94bafa22ef..a569c3c554 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
@@ -294,7 +294,7 @@ DumpUint64 (
 
   Val = *(UINT32*)(Ptr + sizeof (UINT32));
 
-  Val <<= 32;
+  Val = LShiftU64(Val,32);
   Val |= (UINT64)*(UINT32*)Ptr;
 
   Print (Format, Val);