diff --git a/libavcodec/audiotoolboxenc.c b/libavcodec/audiotoolboxenc.c
index 74f7ff543f..4f43d8e43b 100644
--- a/libavcodec/audiotoolboxenc.c
+++ b/libavcodec/audiotoolboxenc.c
@@ -220,7 +220,7 @@ static int get_aac_tag(const AVChannelLayout *in_layout)
     };
     int i;
 
-    for (i = 0; i < FF_ARRAY_ELEMS; i++)
+    for (i = 0; i < FF_ARRAY_ELEMS(map); i++)
         if (!av_channel_layout_compare(in_layout, &map[i].chl))
             return map[i].tag;