diff --git a/drivers/usb/udc/udc_common.c b/drivers/usb/udc/udc_common.c
index 6147167baee..a0bc8f9da02 100644
--- a/drivers/usb/udc/udc_common.c
+++ b/drivers/usb/udc/udc_common.c
@@ -253,7 +253,6 @@ static void ep_update_mps(const struct device *dev,
 			  uint16_t *const mps)
 {
 	struct udc_device_caps caps = udc_caps(dev);
-	const uint16_t spec_iso_mps = caps.hs ? 1024 : 1023;
 	const uint16_t spec_int_mps = caps.hs ? 1024 : 64;
 	const uint16_t spec_bulk_mps = caps.hs ? 512 : 64;
 
@@ -269,12 +268,10 @@ static void ep_update_mps(const struct device *dev,
 	case USB_EP_TYPE_INTERRUPT:
 		*mps = MIN(cfg->caps.mps, spec_int_mps);
 		break;
-	case USB_EP_TYPE_ISO:
-		*mps = MIN(cfg->caps.mps, spec_iso_mps);
-		break;
 	case USB_EP_TYPE_CONTROL:
-		*mps = 64U;
-		break;
+		__fallthrough;
+	case USB_EP_TYPE_ISO:
+		__fallthrough;
 	default:
 		return;
 	}