diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index c9ba49566981..86d8d187f872 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -1007,7 +1007,7 @@ struct map *maps__first(struct maps *maps)
 	return NULL;
 }
 
-struct map *map__next(struct map *map)
+static struct map *__map__next(struct map *map)
 {
 	struct rb_node *next = rb_next(&map->rb_node);
 
@@ -1016,6 +1016,11 @@ struct map *map__next(struct map *map)
 	return NULL;
 }
 
+struct map *map__next(struct map *map)
+{
+	return map ? __map__next(map) : NULL;
+}
+
 struct kmap *__map__kmap(struct map *map)
 {
 	if (!map->dso || !map->dso->kernel)