diff --git a/cockatrice/src/interface/widgets/cards/deck_card_zone_display_widget.h b/cockatrice/src/interface/widgets/cards/deck_card_zone_display_widget.h
index 5e07c6977..dc0f3d734 100644
--- a/cockatrice/src/interface/widgets/cards/deck_card_zone_display_widget.h
+++ b/cockatrice/src/interface/widgets/cards/deck_card_zone_display_widget.h
@@ -50,6 +50,7 @@ public slots:
     void refreshDisplayType(const DisplayType &displayType);
     void onActiveGroupCriteriaChanged(QString activeGroupCriteria);
     void onActiveSortCriteriaChanged(QStringList activeSortCriteria);
+    QList<QString> getGroupCriteriaValueList();
     void onCategoryAddition(const QModelIndex &parent, int first, int last);
     void onCategoryRemoval(const QModelIndex &parent, int first, int last);