diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index da43131be0e7fbc0dab2b0939808bcc1c6b4aaf1..3584a169886f3dfa23b8513c3850dd71f71e22e0 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -353,6 +353,9 @@ static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
 
 			dwc->test_mode_nr = wIndex >> 8;
 			dwc->test_mode = true;
+			break;
+		default:
+			return -EINVAL;
 		}
 		break;