diff --git a/include/sound/ak4117.h b/include/sound/ak4117.h
index 2b96c32..d650d52 100644
--- a/include/sound/ak4117.h
+++ b/include/sound/ak4117.h
@@ -178,7 +178,7 @@
 };
 
 int snd_ak4117_create(struct snd_card *card, ak4117_read_t *read, ak4117_write_t *write,
-		      unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117);
+		      const unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117);
 void snd_ak4117_reg_write(struct ak4117 *ak4117, unsigned char reg, unsigned char mask, unsigned char val);
 void snd_ak4117_reinit(struct ak4117 *ak4117);
 int snd_ak4117_build(struct ak4117 *ak4117, struct snd_pcm_substream *capture_substream);