diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index c4339f97226bddea9db02c578e6fb5774d1d5a0c..b43b6eec322729c19bf81aba1ad48e37997e30d6 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -281,8 +281,6 @@ static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 	const unsigned int *maps;
 	int c;
 
-	if (!bits)
-		return NULL;
 	if (channels > ARRAY_SIZE(chmap->map))
 		return NULL;
 
@@ -293,9 +291,19 @@ static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 	maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
 	chmap->channels = channels;
 	c = 0;
-	for (; bits && *maps; maps++, bits >>= 1) {
-		if (bits & 1)
-			chmap->map[c++] = *maps;
+
+	if (bits) {
+		for (; bits && *maps; maps++, bits >>= 1)
+			if (bits & 1)
+				chmap->map[c++] = *maps;
+	} else {
+		/* If we're missing wChannelConfig, then guess something
+		    to make sure the channel map is not skipped entirely */
+		if (channels == 1)
+			chmap->map[c++] = SNDRV_CHMAP_MONO;
+		else
+			for (; c < channels && *maps; maps++)
+				chmap->map[c++] = *maps;
 	}
 
 	for (; c < channels; c++)