diff --git a/lib/Basic/SourceManager.cpp b/lib/Basic/SourceManager.cpp
index ddb1f39..cdaff2f 100644
--- a/lib/Basic/SourceManager.cpp
+++ b/lib/Basic/SourceManager.cpp
@@ -580,6 +580,7 @@
   assert(IR && "getOrCreateContentCache() cannot return NULL");
 
   const_cast<SrcMgr::ContentCache *>(IR)->replaceBuffer(Buffer, DoNotFree);
+  const_cast<SrcMgr::ContentCache *>(IR)->BufferOverridden = true;
 }
 
 void SourceManager::overrideFileContents(const FileEntry *SourceFile,