diff --git a/clang/include/clang/Frontend/ASTUnit.h b/clang/include/clang/Frontend/ASTUnit.h
index fc27bb9cdfb6..5e409bd7ed83 100644
--- a/clang/include/clang/Frontend/ASTUnit.h
+++ b/clang/include/clang/Frontend/ASTUnit.h
@@ -467,7 +467,7 @@ public:
 
   const FileSystemOptions &getFileSystemOpts() const { return FileSystemOpts; }
 
-  const StringRef getOriginalSourceFileName() {
+  StringRef getOriginalSourceFileName() {
     return OriginalSourceFile;
   }