diff --git a/lib/Basic/SourceLocation.cpp b/lib/Basic/SourceLocation.cpp
index 83c264a..12a4962 100644
--- a/lib/Basic/SourceLocation.cpp
+++ b/lib/Basic/SourceLocation.cpp
@@ -79,6 +79,12 @@
   return SrcMgr->getFileEntryForLoc(Loc);
 }
 
+bool FullSourceLoc::isInSystemHeader() const {
+  assert (isValid());
+  return SrcMgr->isInSystemHeader(Loc);
+}
+
+
 const char * FullSourceLoc::getCharacterData() const {
   assert (isValid());
   return SrcMgr->getCharacterData(Loc);