diff --git a/lib/Serialization/ChainedIncludesSource.cpp b/lib/Serialization/ChainedIncludesSource.cpp
index 454e419..4ee1c16 100644
--- a/lib/Serialization/ChainedIncludesSource.cpp
+++ b/lib/Serialization/ChainedIncludesSource.cpp
@@ -111,7 +111,7 @@
     Clang->getASTContext().setASTMutationListener(
                                             consumer->GetASTMutationListener());
     Clang->setASTConsumer(consumer.take());
-    Clang->createSema(/*CompleteTranslationUnit=*/false, 0);
+    Clang->createSema(TU_Prefix, 0);
 
     if (firstInclude) {
       Preprocessor &PP = Clang->getPreprocessor();
diff --git a/lib/Serialization/GeneratePCH.cpp b/lib/Serialization/GeneratePCH.cpp
index 3f3674e..ac395bb 100644
--- a/lib/Serialization/GeneratePCH.cpp
+++ b/lib/Serialization/GeneratePCH.cpp
@@ -27,7 +27,7 @@
 using namespace clang;
 
 PCHGenerator::PCHGenerator(const Preprocessor &PP,
-                           const std::string &OutputFile,
+                           StringRef OutputFile,
                            bool Chaining,
                            StringRef isysroot,
                            raw_ostream *OS)