diff --git a/indexer/indexer_tool/statistics.hpp b/indexer/indexer_tool/statistics.hpp
index e9d2ea2ae3..73e6b40590 100644
--- a/indexer/indexer_tool/statistics.hpp
+++ b/indexer/indexer_tool/statistics.hpp
@@ -60,7 +60,9 @@ namespace stats
     template <class TKey, class TSet>
     void AddToSet(TKey key, uint32_t sz, TSet & theSet)
     {
-      theSet.insert(GeneralInfoKey<TKey>(key)).first->m_info.Add(sz);
+      // GCC doesn't allow to modify set value ...
+      const_cast<GeneralInfo &>(
+          theSet.insert(GeneralInfoKey<TKey>(key)).first->m_info).Add(sz);
     }
   };