diff --git a/contrib/heputils/include/HEPUtils/Event.h b/contrib/heputils/include/HEPUtils/Event.h
index acc29dfa23..c0ffb9c83c 100644
--- a/contrib/heputils/include/HEPUtils/Event.h
+++ b/contrib/heputils/include/HEPUtils/Event.h
@@ -43,7 +43,7 @@ namespace HEPUtils {
     using CSeqBasePtr = std::shared_ptr<const FJNS::ClusterSequence>;
     
     /// Hold the cluster sequences corresponding to jets, to keep them alive
-    std::map<const std::string, CSeqBasePtr> _cseqs;
+    std::map<std::string, CSeqBasePtr> _cseqs;
     
     /// Missing momentum vector
     P4 _pmiss;