diff --git a/lib/System/Win32/Path.inc b/lib/System/Win32/Path.inc
index 55b4376d73d..b5f63743c9c 100644
--- a/lib/System/Win32/Path.inc
+++ b/lib/System/Win32/Path.inc
@@ -47,7 +47,7 @@ namespace llvm {
 namespace sys {
 const char PathSeparator = ';';
 
-Path::Path(const std::string& p)
+Path::Path(llvm::StringRef p)
   : path(p) {
   FlipBackSlashes(path);
 }