[2377] constify

diff --git a/src/lib/dns/master_loader.cc b/src/lib/dns/master_loader.cc
index ed5f01947b4fab515b0653776bc7fa44790aff54..8b91dd7c0610f72f941b3889cb970b42ced3e8e4 100644 (file)
--- a/src/lib/dns/master_loader.cc
+++ b/src/lib/dns/master_loader.cc
@@ -96,7 +96,7 @@ private:
     const RRClass zone_class_;
     MasterLoaderCallbacks callbacks_;
     AddRRCallback add_callback_;
-    MasterLoader::Options options_;
+    const MasterLoader::Options options_;
     const std::string master_file_;
     std::string string_token_;
     bool initialized_;