diff --git a/clang/lib/Tooling/JSONCompilationDatabase.cpp b/clang/lib/Tooling/JSONCompilationDatabase.cpp
index 3b5f7e2..7dc211e 100644
--- a/clang/lib/Tooling/JSONCompilationDatabase.cpp
+++ b/clang/lib/Tooling/JSONCompilationDatabase.cpp
@@ -176,7 +176,7 @@
 
   std::string Error;
   llvm::raw_string_ostream ES(Error);
-  StringRef Match = MatchTrie.findEquivalent(NativeFilePath.str(), ES);
+  StringRef Match = MatchTrie.findEquivalent(NativeFilePath, ES);
   if (Match.empty())
     return std::vector<CompileCommand>();
   llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
@@ -307,13 +307,13 @@
       SmallString<128> AbsolutePath(
           Directory->getValue(DirectoryStorage));
       llvm::sys::path::append(AbsolutePath, FileName);
-      llvm::sys::path::native(AbsolutePath.str(), NativeFilePath);
+      llvm::sys::path::native(AbsolutePath, NativeFilePath);
     } else {
       llvm::sys::path::native(FileName, NativeFilePath);
     }
     IndexByFile[NativeFilePath].push_back(
         CompileCommandRef(Directory, Command));
-    MatchTrie.insert(NativeFilePath.str());
+    MatchTrie.insert(NativeFilePath);
   }
   return true;
 }