diff --git a/include/llvm/System/Path.h b/include/llvm/System/Path.h
index d4af478c6aa..0461769f971 100644
--- a/include/llvm/System/Path.h
+++ b/include/llvm/System/Path.h
@@ -292,14 +292,6 @@ namespace sys {
     /// @name Disk Accessors
     /// @{
     public:
-      /// This function determines if the path name in this object references
-      /// the root (top level directory) of the file system. The details of what
-      /// is considered the "root" may vary from system to system so this method
-      /// will do the necessary checking.
-      /// @returns true iff the path name references the root directory.
-      /// @brief Determines if the path references the root directory.
-      bool isRootDirectory() const;
-
       /// This function determines if the path name is absolute, as opposed to
       /// relative.
       /// @brief Determine if the path is absolute.
diff --git a/lib/System/Win32/Path.inc b/lib/System/Win32/Path.inc
index 5a0052f3cb2..379527d4ebf 100644
--- a/lib/System/Win32/Path.inc
+++ b/lib/System/Win32/Path.inc
@@ -281,12 +281,6 @@ Path Path::GetMainExecutable(const char *argv0, void *MainAddr) {
 // FIXME: the above set of functions don't map to Windows very well.
 
 
-bool
-Path::isRootDirectory() const {
-  size_t len = path.size();
-  return len > 0 && path[len-1] == '/';
-}
-
 StringRef Path::getDirname() const {
   return getDirnameCharSep(path, "/");
 }