diff --git a/package/kernel/mac80211/patches/331-ath9k-fix-more-data-flag-for-buffered-multicast-pack.patch b/package/kernel/mac80211/patches/331-ath9k-fix-more-data-flag-for-buffered-multicast-pack.patch
new file mode 100644
index 0000000000..d09c82cb97
--- /dev/null
+++ b/package/kernel/mac80211/patches/331-ath9k-fix-more-data-flag-for-buffered-multicast-pack.patch
@@ -0,0 +1,38 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sun, 23 Jul 2017 14:58:22 +0200
+Subject: [PATCH] ath9k: fix more-data flag for buffered multicast packets
+
+The flag needs to be cleared for the last packet in the list, not the
+first one. Fixes some issues with multicast packet loss for powersave
+clients connected to an ath9k AP.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -2451,7 +2451,6 @@ void ath_tx_cabq(struct ieee80211_hw *hw
+ 		.txq = sc->beacon.cabq
+ 	};
+ 	struct ath_tx_info info = {};
+-	struct ieee80211_hdr *hdr;
+ 	struct ath_buf *bf_tail = NULL;
+ 	struct ath_buf *bf;
+ 	LIST_HEAD(bf_q);
+@@ -2495,14 +2494,8 @@ void ath_tx_cabq(struct ieee80211_hw *hw
+ 	if (list_empty(&bf_q))
+ 		return;
+ 
+-	bf = list_first_entry(&bf_q, struct ath_buf, list);
+-	hdr = (struct ieee80211_hdr *) bf->bf_mpdu->data;
+-
+-	if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) {
+-		hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+-		dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
+-			sizeof(*hdr), DMA_TO_DEVICE);
+-	}
++	bf = list_last_entry(&bf_q, struct ath_buf, list);
++	ath9k_set_moredata(sc, bf, false);
+ 
+ 	ath_txq_lock(sc, txctl.txq);
+ 	ath_tx_fill_desc(sc, bf, txctl.txq, 0);