1 files changed, 3 insertions, 9 deletions
diff --git a/src/library/trackmodel.h b/src/library/trackmodel.h
index f51515ca70..b8e7e1be67 100644
--- a/src/library/trackmodel.h
+++ b/src/library/trackmodel.h
@@ -184,20 +184,14 @@ class TrackModel {
         m_eDefaultSortOrder = sortOrder;
     }
 
-    virtual bool isColumnSortable(int column) {
+    virtual bool isColumnSortable(int column) const {
         Q_UNUSED(column);
         return true;
     }
 
-    virtual SortColumnId sortColumnIdFromColumnIndex(int index) {
-        Q_UNUSED(index);
-        return TrackModel::SortColumnId::Invalid;
-    }
+    virtual SortColumnId sortColumnIdFromColumnIndex(int index) const = 0;
 
-    virtual int columnIndexFromSortColumnId(TrackModel::SortColumnId sortColumn) {
-        Q_UNUSED(sortColumn);
-        return -1;
-    }
+    virtual int columnIndexFromSortColumnId(TrackModel::SortColumnId sortColumn) const = 0;
 
     virtual int fieldIndex(const QString& fieldName) const {
         Q_UNUSED(fieldName);