diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index ab23869..6fa3dc0 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -901,8 +901,10 @@
 	/* USB descriptions contain the dB scale in 1/256 dB unit
 	 * while ALSA TLV contains in 1/100 dB unit
 	 */
-	cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
-	cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
+	cval->dBmin =
+		(convert_signed_value(cval, cval->min) * 100) / (cval->res);
+	cval->dBmax =
+		(convert_signed_value(cval, cval->max) * 100) / (cval->res);
 	if (cval->dBmin > cval->dBmax) {
 		/* something is wrong; assume it's either from/to 0dB */
 		if (cval->dBmin < 0)