diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 9e65a42cc9b7..00c1f2960ab7 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -304,7 +304,7 @@ int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
 	 * Generic sync EP handling
 	 */
 
-	if (altsd->bNumEndpoints < 2)
+	if (fmt->ep_idx > 0 || altsd->bNumEndpoints < 2)
 		return 0;
 
 	is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);