diff --git a/sys/dev/sound/usb/uaudio.c b/sys/dev/sound/usb/uaudio.c
--- a/sys/dev/sound/usb/uaudio.c
+++ b/sys/dev/sound/usb/uaudio.c
@@ -1725,6 +1725,7 @@
 	uint8_t audio_if = 0;
 	uint8_t midi_if = 0;
 	uint8_t uma_if_class;
+	uint8_t i;
 
 	while ((desc = usb_desc_foreach(cd, desc))) {
 		if ((desc->bDescriptorType == UDESC_INTERFACE) &&
@@ -2017,6 +2018,20 @@
 		chan->set_alt = 0;
 		chan->cur_alt = CHAN_MAX_ALT;
 
+		for (i = 0; i != chan->num_alt; i++) {
+			chan_alt = &chan->usb_alt[i];
+
+			if (chan_alt->sample_rate == rate &&
+			    chan_alt->channels == channels &&
+			    chan_alt->p_fmt->bPrecision == bit_resolution) {
+				DPRINTF("Skipping duplicate configuration: "
+				    "sample rate = %dHz, channels = %d, "
+				    "bits = %d\n",
+				    rate, channels, bit_resolution);
+				goto next_ep;
+			}
+		}
+
 		chan_alt = &chan->usb_alt[chan->num_alt++];
 
 #ifdef USB_DEBUG