diff --git a/src/baobab.p/baobab-cellrenderers.c b/src/baobab.p/baobab-cellrenderers.c
index d423923..4437c0f 100644
--- a/src/baobab.p/baobab-cellrenderers.c
+++ b/src/baobab.p/baobab-cellrenderers.c
@@ -426,7 +426,7 @@ baobab_cell_renderer_name_class_init (BaobabCellRendererNameClass * klass,
 {
 	baobab_cell_renderer_name_parent_class = g_type_class_peek_parent (klass);
 	g_type_class_adjust_private_offset (klass, &BaobabCellRendererName_private_offset);
-	((GtkCellRendererClass *) klass)->snapshot = (void (*) (GtkCellRenderer*, GtkSnapshot*, GtkWidget*, GdkRectangle*, GdkRectangle*, GtkCellRendererState)) baobab_cell_renderer_name_real_snapshot;
+	((GtkCellRendererClass *) klass)->snapshot = (void (*) (GtkCellRenderer*, GtkSnapshot*, GtkWidget*, const GdkRectangle*, const GdkRectangle*, GtkCellRendererState)) baobab_cell_renderer_name_real_snapshot;
 	G_OBJECT_CLASS (klass)->get_property = _vala_baobab_cell_renderer_name_get_property;
 	G_OBJECT_CLASS (klass)->set_property = _vala_baobab_cell_renderer_name_set_property;
 	G_OBJECT_CLASS (klass)->finalize = baobab_cell_renderer_name_finalize;