diff --git a/libobs/obs-source.c b/libobs/obs-source.c
index e1f2be104..3e901e22f 100644
--- a/libobs/obs-source.c
+++ b/libobs/obs-source.c
@@ -1050,7 +1050,7 @@ static void handle_ts_jump(obs_source_t *source, uint64_t expected,
 }
 
 static void source_signal_audio_data(obs_source_t *source,
-		struct audio_data *in, bool muted)
+		const struct audio_data *in, bool muted)
 {
 	pthread_mutex_lock(&source->audio_cb_mutex);