diff --git a/include/llvm/Support/Path.h b/include/llvm/Support/Path.h
index f9a65e533a9..b2afe1b8e8a 100644
--- a/include/llvm/Support/Path.h
+++ b/include/llvm/Support/Path.h
@@ -173,6 +173,13 @@ void append(SmallVectorImpl<char> &path,
 /// @param result Holds the result of the transformation.
 void native(const Twine &path, SmallVectorImpl<char> &result);
 
+/// Convert path to the native form in place. This is used to give paths to
+/// users and operating system calls in the platform's normal way. For example,
+/// on Windows all '/' are converted to '\'.
+///
+/// @param path A path that is transformed to native format.
+void native(SmallVectorImpl<char> &path);
+
 /// @}
 /// @name Lexical Observers
 /// @{
diff --git a/lib/Support/Path.cpp b/lib/Support/Path.cpp
index 366fb849338..8d707aedded 100644
--- a/lib/Support/Path.cpp
+++ b/lib/Support/Path.cpp
@@ -449,23 +449,18 @@ void replace_extension(SmallVectorImpl<char> &path, const Twine &extension) {
 }
 
 void native(const Twine &path, SmallVectorImpl<char> &result) {
+  assert((!path.isSingleStringRef() ||
+          path.getSingleStringRef().data() != result.data()) &&
+         "path and result are not allowed to overlap!");
   // Clear result.
   result.clear();
-#ifdef LLVM_ON_WIN32
-  SmallString<128> path_storage;
-  StringRef p = path.toStringRef(path_storage);
-  result.reserve(p.size());
-  for (StringRef::const_iterator i = p.begin(),
-                                 e = p.end();
-                                 i != e;
-                                 ++i) {
-    if (*i == '/')
-      result.push_back('\\');
-    else
-      result.push_back(*i);
-  }
-#else
   path.toVector(result);
+  native(result);
+}
+
+void native(SmallVectorImpl<char> &path) {
+#ifdef LLVM_ON_WIN32
+  std::replace(path.begin(), path.end(), '/', '\\');
 #endif
 }