diff --git a/sys/arm64/rockchip/rk3328_codec.c b/sys/arm64/rockchip/rk3328_codec.c
index b00a61f58054..2a5f652fa8c2 100644
--- a/sys/arm64/rockchip/rk3328_codec.c
+++ b/sys/arm64/rockchip/rk3328_codec.c
@@ -364,8 +364,8 @@ rkcodec_attach(device_t dev)
 	RKCODEC_WRITE(sc, CODEC_HPOUT_CTRL, val);
 	DELAY(1000);
 
-	RKCODEC_WRITE(sc, CODEC_HPOUTL_GAIN_CTRL, 0x1f);
-	RKCODEC_WRITE(sc, CODEC_HPOUTR_GAIN_CTRL, 0x1f);
+	RKCODEC_WRITE(sc, CODEC_HPOUTL_GAIN_CTRL, 0x18);
+	RKCODEC_WRITE(sc, CODEC_HPOUTR_GAIN_CTRL, 0x18);
 	DELAY(1000);
 
 	rkcodec_set_mute(sc, false);