diff --git a/libshvcoreqt/include/shv/coreqt/data/valuechange.h b/libshvcoreqt/include/shv/coreqt/data/valuechange.h
index 1d705785a..8196ed5e8 100644
--- a/libshvcoreqt/include/shv/coreqt/data/valuechange.h
+++ b/libshvcoreqt/include/shv/coreqt/data/valuechange.h
@@ -132,6 +132,9 @@ class SHVCOREQT_DECL_EXPORT SerieData : public std::vector<ValueChange>
 
 class SHVCOREQT_DECL_EXPORT SerieDataList : public QVector<SerieData>
 {
+public:
+	bool operator==(const SerieDataList&) const = delete;
+
 };
 
 } // namespace shv::coreqt::data