diff --git a/src/app/qgsstatisticalsummarydockwidget.h b/src/app/qgsstatisticalsummarydockwidget.h
index 74eeeb8cf53..2c10233cd79 100644
--- a/src/app/qgsstatisticalsummarydockwidget.h
+++ b/src/app/qgsstatisticalsummarydockwidget.h
@@ -33,7 +33,6 @@ class QModelIndex;
 class QgsDockBrowserTreeView;
 class QgsLayerItem;
 class QgsDataItem;
-class QgsBrowserTreeFilterProxyModel;
 class QgsVectorLayer;
 
 /**