diff --git a/llvm/lib/Support/Windows/DynamicLibrary.inc b/llvm/lib/Support/Windows/DynamicLibrary.inc
index 083ea90..1d47f08 100644
--- a/llvm/lib/Support/Windows/DynamicLibrary.inc
+++ b/llvm/lib/Support/Windows/DynamicLibrary.inc
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "WindowsSupport.h"
+#include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/raw_ostream.h"
 
 #include <psapi.h>
diff --git a/llvm/lib/Support/Windows/Path.inc b/llvm/lib/Support/Windows/Path.inc
index ab3b222..0d1631d 100644
--- a/llvm/lib/Support/Windows/Path.inc
+++ b/llvm/lib/Support/Windows/Path.inc
@@ -17,6 +17,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/WindowsError.h"
 #include <fcntl.h>
 #include <io.h>
diff --git a/llvm/lib/Support/Windows/Process.inc b/llvm/lib/Support/Windows/Process.inc
index 612eca5..b1dbc5e 100644
--- a/llvm/lib/Support/Windows/Process.inc
+++ b/llvm/lib/Support/Windows/Process.inc
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/Allocator.h"
+#include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/WindowsError.h"
 #include <malloc.h>
diff --git a/llvm/lib/Support/Windows/Program.inc b/llvm/lib/Support/Windows/Program.inc
index 52921cd..73542c1 100644
--- a/llvm/lib/Support/Windows/Program.inc
+++ b/llvm/lib/Support/Windows/Program.inc
@@ -16,6 +16,7 @@
 #include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/Errc.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
 #include "llvm/Support/WindowsError.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstdio>
diff --git a/llvm/lib/Support/Windows/Signals.inc b/llvm/lib/Support/Windows/Signals.inc
index cc225d9..41eb5e5 100644
--- a/llvm/lib/Support/Windows/Signals.inc
+++ b/llvm/lib/Support/Windows/Signals.inc
@@ -10,6 +10,7 @@
 // This file provides the Win32 specific implementation of the Signals class.
 //
 //===----------------------------------------------------------------------===//
+#include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
diff --git a/llvm/lib/Support/Windows/WindowsSupport.h b/llvm/lib/Support/Windows/WindowsSupport.h
index 7b741ac..c2fd6bb 100644
--- a/llvm/lib/Support/Windows/WindowsSupport.h
+++ b/llvm/lib/Support/Windows/WindowsSupport.h
@@ -247,21 +247,7 @@
   return Time;
 }
 
-namespace path {
-std::error_code widenPath(const Twine &Path8,
-                          SmallVectorImpl<wchar_t> &Path16);
-} // end namespace path
-
 namespace windows {
-std::error_code UTF8ToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16);
-/// Convert to UTF16 from the current code page used in the system
-std::error_code CurCPToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16);
-std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
-                            SmallVectorImpl<char> &utf8);
-/// Convert from UTF16 to the current code page used in the system
-std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
-                             SmallVectorImpl<char> &utf8);
-
 // Returns command line arguments. Unlike arguments given to main(),
 // this function guarantees that the returned arguments are encoded in
 // UTF-8 regardless of the current code page setting.