diff --git a/algo/global/StorableRecoResults.h b/algo/global/StorableRecoResults.h
index d128d9b717b92d43b95cd01b66ac33e381c545ed..0f0369d542c0876df33d4e97c5f05342f01b6ab8 100644
--- a/algo/global/StorableRecoResults.h
+++ b/algo/global/StorableRecoResults.h
@@ -46,7 +46,7 @@ namespace cbm::algo
     friend class boost::serialization::access;
 
     template<class Archive>
-    void serialize(Archive& ar, const unsigned int version)
+    void serialize(Archive& ar, unsigned int /*version*/)
     {
       ar& fTsIndex;
       ar& fTsStartTime;