diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index 3eec8e4..2a96877 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -14266,7 +14266,7 @@ gtk_tree_view_enable_model_drag_source (GtkTreeView              *tree_view,
   g_return_if_fail (GTK_IS_TREE_VIEW (tree_view));
 
   gtk_drag_source_set (GTK_WIDGET (tree_view),
-		       0,
+		       start_button_mask,
 		       targets,
 		       n_targets,
 		       actions);
