diff --git a/sound/soc/codecs/jz4770.c b/sound/soc/codecs/jz4770.c
index 34775aa62402..4dee585761c2 100644
--- a/sound/soc/codecs/jz4770.c
+++ b/sound/soc/codecs/jz4770.c
@@ -303,7 +303,6 @@ static int jz4770_codec_digital_mute(struct snd_soc_dai *dai, int mute)
 static const DECLARE_TLV_DB_MINMAX_MUTE(dac_tlv, -3100, 0);
 static const DECLARE_TLV_DB_SCALE(adc_tlv, 0, 100, 0);
 static const DECLARE_TLV_DB_MINMAX(out_tlv, -2500, 600);
-static const DECLARE_TLV_DB_SCALE(mic_boost_tlv, 0, 400, 0);
 static const DECLARE_TLV_DB_SCALE(linein_tlv, -2500, 100, 0);
 
 /* Unconditional controls. */