diff --git a/include/wifi.h b/include/wifi.h
index 979860d..a1f2e82 100644
--- a/include/wifi.h
+++ b/include/wifi.h
@@ -15,14 +15,12 @@
 #ifndef _WIFI_H_
 #define _WIFI_H_
 
-
 #ifdef BIT
 /* #error	"BIT define occurred earlier elsewhere!\n" */
 #undef BIT
 #endif
 #define BIT(x)	(1 << (x))
 
-
 #define WLAN_ETHHDR_LEN		14
 #define WLAN_ETHADDR_LEN	6
 #define WLAN_IEEE_OUI_LEN	3
@@ -1027,9 +1025,10 @@ typedef enum _HT_CAP_AMPDU_DENSITY {
  * A-PMDU buffer sizes
  * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2)
  */
-//#define IEEE80211_MIN_AMPDU_BUF 0x8
-//#define IEEE80211_MAX_AMPDU_BUF 0x40
-
+#define IEEE80211_MIN_AMPDU_BUF 0x8
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4,19,0))
+#define IEEE80211_MAX_AMPDU_BUF 0x40
+#endif
 
 /* Spatial Multiplexing Power Save Modes */
 #define WLAN_HT_CAP_SM_PS_STATIC		0
@@ -1037,7 +1036,6 @@ typedef enum _HT_CAP_AMPDU_DENSITY {
 #define WLAN_HT_CAP_SM_PS_INVALID	2
 #define WLAN_HT_CAP_SM_PS_DISABLED	3
 
-
 #define OP_MODE_PURE                    0
 #define OP_MODE_MAY_BE_LEGACY_STAS      1
 #define OP_MODE_20MHZ_HT_STA_ASSOCED    2
@@ -1064,9 +1062,6 @@ typedef enum _HT_CAP_AMPDU_DENSITY {
 #define HT_INFO_STBC_PARAM_LSIG_TXOP_PROTECT_ALLOWED	((u16) BIT(9))
 #define HT_INFO_STBC_PARAM_PCO_ACTIVE			((u16) BIT(10))
 #define HT_INFO_STBC_PARAM_PCO_PHASE			((u16) BIT(11))
-
-
-
 /* #endif */
 
 /*	===============WPS Section=============== */