diff --git a/sys/dev/rtwn/if_rtwn.c b/sys/dev/rtwn/if_rtwn.c
--- a/sys/dev/rtwn/if_rtwn.c
+++ b/sys/dev/rtwn/if_rtwn.c
@@ -298,6 +298,11 @@
 	sc->sc_node_free = ic->ic_node_free;
 	ic->ic_node_free = rtwn_node_free;
 
+	/* Note: this has to happen AFTER ieee80211_ifattach() */
+	ieee80211_set_software_ciphers(ic, IEEE80211_CRYPTO_WEP |
+	    IEEE80211_CRYPTO_TKIP | IEEE80211_CRYPTO_AES_CCM |
+	    IEEE80211_CRYPTO_AES_GCM_128);
+
 	rtwn_postattach(sc);
 	rtwn_radiotap_attach(sc);