diff --git a/include/mixer_abst.h b/include/mixer_abst.h
index ea8c096e..ec23e0dd 100644
--- a/include/mixer_abst.h
+++ b/include/mixer_abst.h
@@ -97,10 +97,10 @@ struct sm_elem_ops {
 
 int snd_mixer_selem_compare(const snd_mixer_elem_t *c1, const snd_mixer_elem_t *c2);
 
-int snd_mixer_sbasic_info(const snd_mixer_class_t *class, sm_class_basic_t *info);
-void *snd_mixer_sbasic_get_private(const snd_mixer_class_t *class);
-void snd_mixer_sbasic_set_private(const snd_mixer_class_t *class, void *private_data);
-void snd_mixer_sbasic_set_private_free(const snd_mixer_class_t *class, void (*private_free)(snd_mixer_class_t *class));
+int snd_mixer_sbasic_info(const snd_mixer_class_t *mixer_class, sm_class_basic_t *info);
+void *snd_mixer_sbasic_get_private(const snd_mixer_class_t *mixer_class);
+void snd_mixer_sbasic_set_private(const snd_mixer_class_t *mixer_class, void *private_data);
+void snd_mixer_sbasic_set_private_free(const snd_mixer_class_t *mixer_class, void (*private_free)(snd_mixer_class_t *mixer_class));
 
 /** \} */