diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
index 18c4983e95..5cab20023d 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
@@ -297,7 +297,7 @@ DumpUint64 (
   Val = *(UINT32*)(Ptr + sizeof (UINT32));
 
   Val <<= 32;
-  Val |= *(UINT32*)Ptr;
+  Val |= (UINT64)*(UINT32*)Ptr;
 
   Print (Format, Val);
 }
diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c
index 47ce93f104..4199e82ab1 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c
@@ -284,6 +284,7 @@ ConvertStrToAcpiSignature (
   UINT8 Index;
   CHAR8 Ptr[4];
 
+  ZeroMem (Ptr, sizeof (Ptr));
   Index = 0;
 
   // Convert to Upper case and convert to ASCII
diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c b/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c
index 245700a253..c6eb7087cf 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c
@@ -118,7 +118,7 @@ UefiShellAcpiViewCommandLibConstructor (
   gShellAcpiViewHiiHandle = NULL;
 
   // Check Shell Profile Debug1 bit of the profiles mask
-  if ((FixedPcdGet8 (PcdShellProfileMask) & BIT1) == 0) {
+  if ((PcdGet8 (PcdShellProfileMask) & BIT1) == 0) {
     return EFI_SUCCESS;
   }