diff --git a/src/calamares/progresstree/ProgressTreeModel.cpp b/src/calamares/progresstree/ProgressTreeModel.cpp
index 19fb28f61..0b0c47c72 100644
--- a/src/calamares/progresstree/ProgressTreeModel.cpp
+++ b/src/calamares/progresstree/ProgressTreeModel.cpp
@@ -40,7 +40,7 @@ Qt::ItemFlags
 ProgressTreeModel::flags( const QModelIndex& index ) const
 {
     if ( !index.isValid() )
-        return 0;
+        return Qt::ItemFlags();
 
     return Qt::ItemIsEnabled;
 }