diff --git a/include/sound/ak4531_codec.h b/include/sound/ak4531_codec.h
index 8b18992..4e7c661 100644
--- a/include/sound/ak4531_codec.h
+++ b/include/sound/ak4531_codec.h
@@ -64,17 +64,17 @@
 #define AK4531_AD_IN    0x18	/* AD input select */
 #define AK4531_MIC_GAIN 0x19	/* MIC amplified gain */
 
-typedef struct _snd_ak4531 ak4531_t;
-
-struct _snd_ak4531 {
-	void (*write) (ak4531_t *ak4531, unsigned short reg, unsigned short val);
+struct snd_ak4531 {
+	void (*write) (struct snd_ak4531 *ak4531, unsigned short reg,
+		       unsigned short val);
 	void *private_data;
-	void (*private_free) (ak4531_t *ak4531);
+	void (*private_free) (struct snd_ak4531 *ak4531);
 	/* --- */
 	unsigned char regs[0x20];
 	struct semaphore reg_mutex;
 };
 
-int snd_ak4531_mixer(snd_card_t * card, ak4531_t * _ak4531, ak4531_t ** rak4531);
+int snd_ak4531_mixer(struct snd_card *card, struct snd_ak4531 *_ak4531,
+		     struct snd_ak4531 **rak4531);
 
 #endif /* __SOUND_AK4531_CODEC_H */