diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 546333b..135af04 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -30,7 +30,6 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
-#include "llvm/Support/PathV1.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/raw_ostream.h"
@@ -1615,29 +1614,15 @@
 
 std::string Driver::GetTemporaryPath(StringRef Prefix, const char *Suffix)
   const {
-  // FIXME: This is lame; sys::Path should provide this function (in particular,
-  // it should know how to find the temporary files dir).
-  std::string Error;
-  const char *TmpDir = ::getenv("TMPDIR");
-  if (!TmpDir)
-    TmpDir = ::getenv("TEMP");
-  if (!TmpDir)
-    TmpDir = ::getenv("TMP");
-  if (!TmpDir)
-    TmpDir = "/tmp";
-  llvm::sys::Path P(TmpDir);
-  P.appendComponent(Prefix);
-  if (P.makeUnique(false, &Error)) {
-    Diag(clang::diag::err_unable_to_make_temp) << Error;
+  SmallString<128> Path;
+  llvm::error_code EC =
+    llvm::sys::fs::unique_file(Prefix + "-%%%%%%." + Suffix, Path);
+  if (EC) {
+    Diag(clang::diag::err_unable_to_make_temp) << EC.message();
     return "";
   }
 
-  // FIXME: Grumble, makeUnique sometimes leaves the file around!?  PR3837.
-  P.eraseFromDisk(false, 0);
-
-  if (Suffix)
-    P.appendSuffix(Suffix);
-  return P.str();
+  return Path.str();
 }
 
 /// \brief Compute target triple from args.