diff --git a/src/libs/timeline/timelinenotesmodel.h b/src/libs/timeline/timelinenotesmodel.h
index 4a220927ecc..a56a32c02d9 100644
--- a/src/libs/timeline/timelinenotesmodel.h
+++ b/src/libs/timeline/timelinenotesmodel.h
@@ -45,7 +45,6 @@ public:
 
     int count() const;
     void addTimelineModel(const TimelineModel *timelineModel);
-    const TimelineModel *timelineModelByModelId(int timelineModel) const;
     QList<const TimelineModel *> timelineModels() const;
 
     Q_INVOKABLE int typeId(int index) const;
@@ -69,6 +68,9 @@ public:
 
     void clear();
 
+protected:
+    const TimelineModel *timelineModelByModelId(int modelId) const;
+
 signals:
     void changed(int typeId, int timelineModel, int timelineIndex);