--- a/ext/alsa/gstalsamixer.c	2011-12-30 00:00:00.000000000 +0000
+++ b/ext/alsa/gstalsamixer.c	2023-01-01 00:00:00.000000000 +0000
@@ -958,7 +958,7 @@ _gst_alsa_mixer_set_interface (GstAlsaMixer * mixer,
 {
   g_return_if_fail (mixer != NULL);
 
-  mixer->interface = g_object_ref (G_OBJECT (interface));
+  mixer->interface = g_object_ref ((GstMixer *)(interface));
 }