diff --git a/gtk/gtkbox.c b/gtk/gtkbox.c
index 6b9391eb8c..557d9fdac2 100644
--- a/gtk/gtkbox.c
+++ b/gtk/gtkbox.c
@@ -2614,7 +2614,7 @@ gtk_box_set_center_widget (GtkBox    *box,
  *
  * Retrieves the center widget of the box.
  *
- * Returns: the center widget
+ * Returns: (transfer none): the center widget
  *
  * Since: 3.12
  */