diff --git a/BaseTools/Source/C/VfrCompile/Pccts/h/PBlackBox.h b/BaseTools/Source/C/VfrCompile/Pccts/h/PBlackBox.h
index d25b8d69392c..149c27208184 100644
--- a/BaseTools/Source/C/VfrCompile/Pccts/h/PBlackBox.h
+++ b/BaseTools/Source/C/VfrCompile/Pccts/h/PBlackBox.h
@@ -33,9 +33,7 @@
 
 #include "pcctscfg.h"
 
-#include "pccts_iostream.h"
-
-PCCTS_NAMESPACE_STD
+#include <iostream>
 
 //  MR20 Added #include for "DLexerBase.h"
 
@@ -55,7 +53,7 @@ class DllExportPCCTS ParserBlackBox {
 
   // no copy assignment allowed
   ParserBlackBox & operator=(ParserBlackBox const &);
-  
+
 protected:
   DLGFileInput *in;
   Lexer *scan;
@@ -65,9 +63,9 @@ class DllExportPCCTS ParserBlackBox {
   FILE *file;
   int openByBlackBox;    /* MR21 Don't close what we haven't opened */
 public:
-	
+
   ParserBlackBox(FILE *f)
-    : in(0)
+  : in(0)
     , scan(0)
     , tok(0)
     , pipe(0)
@@ -77,7 +75,7 @@ class DllExportPCCTS ParserBlackBox {
   {
     if (f == NULL)
     {
-      cerr << "invalid file pointer\n"; 
+      std::cerr << "invalid file pointer\n";
     }
     else
     {
@@ -101,10 +99,10 @@ class DllExportPCCTS ParserBlackBox {
     , file(0)
     , openByBlackBox(0)
   {
-    FILE *f = fopen(fname, "r");
+    FILE *f = std::fopen(fname, "r");
     if ( f==NULL ) {
       openByBlackBox = 0;
-      cerr << "cannot open " << fname << "\n"; return;
+      std::cerr << "cannot open " << fname << "\n"; return;
     }
     else {
       openByBlackBox = 1;
@@ -118,12 +116,12 @@ class DllExportPCCTS ParserBlackBox {
       _parser->init();
     }
   }
-	
+
   ~ParserBlackBox()
   {
     delete in; delete scan; delete pipe; delete _parser; delete tok;
     if (1 == openByBlackBox) {
-      fclose(file);
+      std::fclose(file);
     }
   }