diff --git a/src/pixiewps.c b/src/pixiewps.c
index d96c109..6e5cf29 100644
--- a/src/pixiewps.c
+++ b/src/pixiewps.c
@@ -610,6 +610,7 @@ usage_err:
 		} else {
 			p_mode[0] = RT;
 			if (wps->pke && (!(wps->e_nonce[0] & 0x80) && !(wps->e_nonce[4]  & 0x80) &&
+					!(wps->e_nonce[8] & 0x80) && !(wps->e_nonce[12] & 0x80))) {
 				p_mode[1] = RTL819x;
 				p_mode[2] = ECOS_SIMPLE;
 				p_mode[3] = NONE;