diff --git a/src/NullOutputFile.h b/src/NullOutputFile.h
index ff14ef1b..97c05562 100644
--- a/src/NullOutputFile.h
+++ b/src/NullOutputFile.h
@@ -43,8 +43,8 @@ class NullOutputFile:public OutputFile {
 public:
   virtual ~NullOutputFile() {}
   virtual size_t write(const char* str) { return 0; }
-  virtual int vprintf(const char* format, va_list va) { return 0; }
   virtual int flush() { return 0; }
+  virtual int vprintf(const char* format, va_list va) { return 0; }
   virtual bool supportsColor() { return false; }
 };
 
diff --git a/src/aria2api.cc b/src/aria2api.cc
index 22963e83..c9474a8b 100644
--- a/src/aria2api.cc
+++ b/src/aria2api.cc
@@ -56,6 +56,7 @@
 #include "BitfieldMan.h"
 #include "DownloadContext.h"
 #include "RpcMethodImpl.h"
+#include "console.h"
 
 namespace aria2 {
 
@@ -72,6 +73,7 @@ Platform* platform = 0;
 
 int libraryInit()
 {
+  global::initConsole(true);
   try {
     platform = new Platform();
   } catch(RecoverableException& e) {
diff --git a/src/console.cc b/src/console.cc
index cf0782a3..109c30ac 100644
--- a/src/console.cc
+++ b/src/console.cc
@@ -33,38 +33,47 @@
  */
 /* copyright --> */
 #include "console.h"
+#include "NullOutputFile.h"
+#ifdef __MINGW32__
+# include "WinConsoleFile.h"
+#else // !__MINGW32__
+# include "BufferedFile.h"
+#endif // !__MINGW32__
 
 namespace aria2 {
 
 namespace global {
 
-#ifdef __MINGW32__
-const SharedHandle<WinConsoleFile>& cout()
-{
-  static SharedHandle<WinConsoleFile> f(new WinConsoleFile(STD_OUTPUT_HANDLE));
-  return f;
-}
-#else // !__MINGW32__
-const SharedHandle<BufferedFile>& cout()
-{
-  static SharedHandle<BufferedFile> f(new BufferedFile(stdout));
-  return f;
-}
-#endif // !__MINGW32__
+namespace {
+Console consoleCout;
+Console consoleCerr;
+};
 
+void initConsole(bool suppress)
+{
+  if(suppress) {
+    consoleCerr.reset(new NullOutputFile());
+    consoleCout.reset(new NullOutputFile());
+  } else {
 #ifdef __MINGW32__
-const SharedHandle<WinConsoleFile>& cerr()
-{
-  static SharedHandle<WinConsoleFile> f(new WinConsoleFile(STD_ERROR_HANDLE));
-  return f;
-}
+    consoleCout.reset(new WinConsoleFile(STD_OUTPUT_HANDLE));
+    consoleCerr.reset(new WinConsoleFile(STD_ERROR_HANDLE));
 #else // !__MINGW32__
-const SharedHandle<BufferedFile>& cerr()
-{
-  static SharedHandle<BufferedFile> f(new BufferedFile(stderr));
-  return f;
-}
+    consoleCout.reset(new BufferedFile(stdout));
+    consoleCerr.reset(new BufferedFile(stderr));
 #endif // !__MINGW32__
+  }
+}
+
+const Console& cout()
+{
+  return consoleCout;
+}
+
+const Console& cerr()
+{
+  return consoleCerr;
+}
 
 } // namespace global
 
diff --git a/src/console.h b/src/console.h
index 3944b415..8b99f7f1 100644
--- a/src/console.h
+++ b/src/console.h
@@ -37,22 +37,18 @@
 
 #include "common.h"
 #include "SharedHandle.h"
-#ifdef __MINGW32__
-# include "WinConsoleFile.h"
-#else // !__MINGW32__
-# include "BufferedFile.h"
-#endif // !__MINGW32__
+#include "OutputFile.h"
 
 namespace aria2 {
 
-#ifdef __MINGW32__
-typedef SharedHandle<WinConsoleFile> Console;
-#else // !__MINGW32__
-typedef SharedHandle<BufferedFile> Console;
-#endif // !__MINGW32__
+typedef SharedHandle<OutputFile> Console;
 
 namespace global {
 
+// Initialize console output facility. If the |suppress| is true, all
+// output sent to the console objects are discarded.
+void initConsole(bool suppress);
+
 const Console& cout();
 const Console& cerr();
 
diff --git a/src/main.cc b/src/main.cc
index ebb7e9de..3bb11889 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -62,6 +62,7 @@ error_code::Value main(int argc, char** argv)
 int main(int argc, char** argv)
 {
   aria2::error_code::Value r;
+  aria2::global::initConsole(false);
   try {
     aria2::Platform platform;
     r = aria2::main(argc, argv);
diff --git a/test/AllTest.cc b/test/AllTest.cc
index de51085c..e0cf13db 100644
--- a/test/AllTest.cc
+++ b/test/AllTest.cc
@@ -9,8 +9,10 @@
 #include "Platform.h"
 #include "SocketCore.h"
 #include "util.h"
+#include "console.h"
 
 int main(int argc, char* argv[]) {
+  aria2::global::initConsole(false);
   aria2::Platform platform;
 
 #ifdef ENABLE_NLS