diff --git a/src/highlight.c b/src/highlight.c
index 64f37a4..7a7e537 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -3743,7 +3743,7 @@
 	listitem_T	*li;
 	int		i;
 
-	range_list_materialize(pos_list);
+	CHECK_LIST_MATERIALIZE(pos_list);
 	for (i = 0, li = pos_list->lv_first; li != NULL && i < MAXPOSMATCH;
 							i++, li = li->li_next)
 	{