diff --git a/lib/Basic/SourceLocation.cpp b/lib/Basic/SourceLocation.cpp
index dcfd547..1f5804ff 100644
--- a/lib/Basic/SourceLocation.cpp
+++ b/lib/Basic/SourceLocation.cpp
@@ -111,7 +111,7 @@
 
 const llvm::MemoryBuffer* FullSourceLoc::getBuffer() const {
   assert(isValid());
-  return SrcMgr->getBuffer(*this);
+  return SrcMgr->getBuffer(SrcMgr->getCanonicalFileID(*this));
 }
 
 void FullSourceLoc::dump() const {