diff --git a/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc b/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
index 18d53f4d..d5e7645d 100644
--- a/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
+++ b/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
@@ -1280,6 +1280,9 @@ XUD_Result_t AudioClassRequests_1(XUD_ep ep0_out, XUD_ep ep0_in, USB_SetupPacket
             buffer[0] = (VOLUME_RES_MIXER & 0xff);
             buffer[1] = (VOLUME_RES_MIXER >> 8);
             return XUD_DoGetRequest(ep0_out, ep0_in, buffer, 2, sp.wLength);
+
+        default:
+            break;
     }
 #endif
     return XUD_RES_ERR;