diff --git a/package/mac80211/patches/510-ath9k_aggr_delim_fix.patch b/package/mac80211/patches/510-ath9k_aggr_delim_fix.patch
new file mode 100644
index 0000000000..a34ff92645
--- /dev/null
+++ b/package/mac80211/patches/510-ath9k_aggr_delim_fix.patch
@@ -0,0 +1,13 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -177,8 +177,8 @@ void ath_descdma_cleanup(struct ath_soft
+ 
+ /* returns delimiter padding required given the packet length */
+ #define ATH_AGGR_GET_NDELIM(_len)					\
+-	(((((_len) + ATH_AGGR_DELIM_SZ) < ATH_AGGR_MINPLEN) ?           \
+-	  (ATH_AGGR_MINPLEN - (_len) - ATH_AGGR_DELIM_SZ) : 0) >> 2)
++	(((_len) >= ATH_AGGR_MINPLEN) ? 0 :				\
++	 DIV_ROUND_UP(ATH_AGGR_MINPLEN - (_len), ATH_AGGR_DELIM_SZ))
+ 
+ #define BAW_WITHIN(_start, _bawsz, _seqno) \
+ 	((((_seqno) - (_start)) & 4095) < (_bawsz))