diff --git a/include/clang/Frontend/ASTUnit.h b/include/clang/Frontend/ASTUnit.h
index e6ef410..cadf281 100644
--- a/include/clang/Frontend/ASTUnit.h
+++ b/include/clang/Frontend/ASTUnit.h
@@ -623,6 +623,9 @@
   /// \returns true if the iteration was complete or false if it was aborted.
   bool visitLocalTopLevelDecls(void *context, DeclVisitorFn Fn);
 
+  /// \brief Get the PCH file if one was included.
+  const FileEntry *getPCHFile();
+
   llvm::MemoryBuffer *getBufferForFile(StringRef Filename,
                                        std::string *ErrorStr = 0);
 
diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
index 79559a3..136e72a 100644
--- a/lib/Frontend/ASTUnit.cpp
+++ b/lib/Frontend/ASTUnit.cpp
@@ -2816,6 +2816,42 @@
   return true;
 }
 
+namespace {
+struct PCHLocatorInfo {
+  serialization::ModuleFile *Mod;
+  PCHLocatorInfo() : Mod(0) {}
+};
+}
+
+static bool PCHLocator(serialization::ModuleFile &M, void *UserData) {
+  PCHLocatorInfo &Info = *static_cast<PCHLocatorInfo*>(UserData);
+  switch (M.Kind) {
+  case serialization::MK_Module:
+    return true; // skip dependencies.
+  case serialization::MK_PCH:
+    Info.Mod = &M;
+    return true; // found it.
+  case serialization::MK_Preamble:
+    return false; // look in dependencies.
+  case serialization::MK_MainFile:
+    return false; // look in dependencies.
+  }
+
+  return true;
+}
+
+const FileEntry *ASTUnit::getPCHFile() {
+  if (!Reader)
+    return 0;
+
+  PCHLocatorInfo Info;
+  Reader->getModuleManager().visit(PCHLocator, &Info);
+  if (Info.Mod)
+    return Info.Mod->File;
+
+  return 0;
+}
+
 void ASTUnit::PreambleData::countLines() const {
   NumLines = 0;
   if (empty())
diff --git a/tools/libclang/Indexing.cpp b/tools/libclang/Indexing.cpp
index 6cf3a63..0b12d82 100644
--- a/tools/libclang/Indexing.cpp
+++ b/tools/libclang/Indexing.cpp
@@ -197,13 +197,20 @@
 
   virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
                                          StringRef InFile) {
+    PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
+
     // We usually disable the preprocessing record for indexing even if the
     // original preprocessing options had it enabled. Now that the indexing
     // Preprocessor has been created (without a preprocessing record), re-enable
     // the option in case modules are enabled, so that the detailed record
     // option can be propagated when the module file is generated.
     if (CI.getLangOpts().Modules && EnablePPDetailedRecordForModules)
-      CI.getPreprocessorOpts().DetailedRecord = true;
+      PPOpts.DetailedRecord = true;
+
+    if (!PPOpts.ImplicitPCHInclude.empty()) {
+      IndexCtx.importedPCH(
+                        CI.getFileManager().getFile(PPOpts.ImplicitPCHInclude));
+    }
 
     IndexCtx.setASTContext(CI.getASTContext());
     Preprocessor &PP = CI.getPreprocessor();
@@ -536,6 +543,9 @@
 
   ASTUnit::ConcurrencyCheck Check(*Unit);
 
+  if (const FileEntry *PCHFile = Unit->getPCHFile())
+    IndexCtx->importedPCH(PCHFile);
+
   FileManager &FileMgr = Unit->getFileManager();
 
   if (Unit->getOriginalSourceFileName().empty())
diff --git a/tools/libclang/IndexingContext.cpp b/tools/libclang/IndexingContext.cpp
index c964e96..1186191 100644
--- a/tools/libclang/IndexingContext.cpp
+++ b/tools/libclang/IndexingContext.cpp
@@ -273,6 +273,21 @@
   (void)astFile;
 }
 
+void IndexingContext::importedPCH(const FileEntry *File) {
+  if (!CB.importedASTFile)
+    return;
+
+  CXIdxImportedASTFileInfo Info = {
+                                    (CXFile)File,
+                                    getIndexLoc(SourceLocation()),
+                                    /*isModule=*/false,
+                                    /*isImplicit=*/false,
+                                    /*moduleName=*/NULL
+                                  };
+  CXIdxClientASTFile astFile = CB.importedASTFile(ClientData, &Info);
+  (void)astFile;
+}
+
 void IndexingContext::startedTranslationUnit() {
   CXIdxClientContainer idxCont = 0;
   if (CB.startedTranslationUnit)
diff --git a/tools/libclang/IndexingContext.h b/tools/libclang/IndexingContext.h
index e556d4d..e92894a 100644
--- a/tools/libclang/IndexingContext.h
+++ b/tools/libclang/IndexingContext.h
@@ -383,6 +383,7 @@
                       bool isImport, bool isAngled);
 
   void importedModule(const ImportDecl *ImportD);
+  void importedPCH(const FileEntry *File);
 
   void startedTranslationUnit();