diff --git a/audio/audio_driver.c b/audio/audio_driver.c
index d3f623430e..4b2dbb3a32 100644
--- a/audio/audio_driver.c
+++ b/audio/audio_driver.c
@@ -944,8 +944,12 @@ static void audio_mixer_play_stop_cb(audio_mixer_sound_t *sound, unsigned reason
    {
       case AUDIO_MIXER_SOUND_FINISHED:
          audio_mixer_destroy(sound);
+
+         if (audio_mixer_streams[idx].buf != NULL)
+            free(audio_mixer_streams[idx].buf);
          audio_mixer_streams[idx].state   = AUDIO_STREAM_STATE_NONE;
          audio_mixer_streams[idx].volume  = 0.0f;
+         audio_mixer_streams[idx].buf     = NULL;
          audio_mixer_streams[idx].stop_cb = NULL;
          audio_mixer_streams[idx].handle  = NULL;
          audio_mixer_streams[idx].voice   = NULL;