diff --git a/src/twn_audio.c b/src/twn_audio.c
index 6a4eb6c..910c4ff 100644
--- a/src/twn_audio.c
+++ b/src/twn_audio.c
@@ -546,7 +546,7 @@ void audio_callback(void *userdata, uint8_t *stream, int len) {
                                        i == audio_channels_len - 1);
     }
 
-    size_t const unnamed_audio_channels_len = shlen(ctx.unnamed_audio_channels);
+    size_t const unnamed_audio_channels_len = arrlen(ctx.unnamed_audio_channels);
     for (size_t i = 0; i < unnamed_audio_channels_len; ++i) {
         sanity_check_channel((AudioChannelItem){NULL, ctx.unnamed_audio_channels[i]});
         audio_sample_and_mixin_channel(&ctx.unnamed_audio_channels[i],