+--- a/ath/if_ath.c
++++ b/ath/if_ath.c
+@@ -1957,6 +1957,7 @@ ath_uapsd_processtriggers(struct ath_sof
+ if (qwh->i_fc[1] & IEEE80211_FC1_PWR_MGT) {
+ ni->ni_flags |=
+ IEEE80211_NODE_UAPSD_TRIG;
++ ni->ni_vap->iv_ps_sta++;
+ ic->ic_uapsdmaxtriggers++;
+ WME_UAPSD_NODE_TRIGSEQINIT(ni);
+ DPRINTF(sc, ATH_DEBUG_UAPSD,
+@@ -1967,6 +1968,7 @@ ath_uapsd_processtriggers(struct ath_sof
+ } else {
+ ni->ni_flags &=
+ ~IEEE80211_NODE_UAPSD_TRIG;
++ ni->ni_vap->iv_ps_sta--;
+ ic->ic_uapsdmaxtriggers--;
+ DPRINTF(sc, ATH_DEBUG_UAPSD,
+ "Node (" MAC_FMT ") no longer U-APSD"