--- ieee80211_freebsd.c.orig	2007-08-22 20:02:35.000000000 +0800
+++ ieee80211_freebsd.c	2007-08-22 20:02:54.000000000 +0800
@@ -214,7 +214,7 @@ ieee80211_getmgtframe(uint8_t **frm, int
 			MC_ALIGN(m, len);
 	}
 	if (m != NULL) {
-		m->m_data += sizeof(struct ieee80211_frame);
+		m->m_data += headroom;
 		*frm = m->m_data;
 	}
 	return m;