diff --git a/package/mac80211/patches/300-pending_work.patch b/package/mac80211/patches/300-pending_work.patch
index 8e78e1fba3..0900596dc9 100644
--- a/package/mac80211/patches/300-pending_work.patch
+++ b/package/mac80211/patches/300-pending_work.patch
@@ -347,7 +347,17 @@
  }
  
  static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
-@@ -2169,7 +2166,9 @@ static void ath_tx_complete_poll_work(st
+@@ -664,7 +661,8 @@ static int ath_compute_num_delims(struct
+ 	 * TODO - this could be improved to be dependent on the rate.
+ 	 *      The hardware can keep up at lower rates, but not higher rates
+ 	 */
+-	if (fi->keyix != ATH9K_TXKEYIX_INVALID)
++	if ((fi->keyix != ATH9K_TXKEYIX_INVALID) &&
++	    !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA))
+ 		ndelim += ATH_AGGR_ENCRYPTDELIM;
+ 
+ 	/*
+@@ -2169,7 +2167,9 @@ static void ath_tx_complete_poll_work(st
  	if (needreset) {
  		ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_RESET,
  			"tx hung, resetting the chip\n");