Index: src/drivers/net/wireless/intel/iwlwifi/iwl-backport-compat.h
===================================================================
--- src.orig/drivers/net/wireless/intel/iwlwifi/iwl-backport-compat.h	2019-09-06 15:58:07.846046124 +0200
+++ src/drivers/net/wireless/intel/iwlwifi/iwl-backport-compat.h	2019-09-06 15:58:12.144977964 +0200
@@ -1,6 +1,6 @@
 #ifndef IWL_BACKPORT_COMPAT_H
 #define IWL_BACKPORT_COMPAT_H
 
-
+#define IEEE80211_MAX_AMPDU_BUF_HT    0x40
 
 #endif /* IWL_BACKPORT_COMPAT_H */
Index: src/drivers/net/wireless/intel/iwlwifi/cfg/22000.c
===================================================================
--- src.orig/drivers/net/wireless/intel/iwlwifi/cfg/22000.c	2019-09-06 15:58:11.358990426 +0200
+++ src/drivers/net/wireless/intel/iwlwifi/cfg/22000.c	2019-09-06 15:58:40.846522899 +0200
@@ -55,6 +55,8 @@
 #include <linux/stringify.h>
 #include "iwl-config.h"
 
+#include "iwl-backport-compat.h"
+
 /* Highest firmware API version supported */
 #define IWL_22000_UCODE_API_MAX	48