diff --git a/include/wifi.h b/include/wifi.h
index 9d21a5a..3c6ef03 100644
--- a/include/wifi.h
+++ b/include/wifi.h
@@ -1006,8 +1006,9 @@ typedef enum _HT_CAP_AMPDU_DENSITY {
  * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2)
  */
 #define IEEE80211_MIN_AMPDU_BUF 0x8
+#ifndef IEEE80211_MAX_AMPDU_BUF
 #define IEEE80211_MAX_AMPDU_BUF 0x40
-
+#endif
 
 /* Spatial Multiplexing Power Save Modes */
 #define WLAN_HT_CAP_SM_PS_STATIC		0
diff --git a/os_dep/linux/os_intfs.c b/os_dep/linux/os_intfs.c
index 748a409..923417c 100644
--- a/os_dep/linux/os_intfs.c
+++ b/os_dep/linux/os_intfs.c
@@ -848,13 +848,14 @@ unsigned int rtw_classify8021d(struct sk_buff *skb)
 
  
 static u16 rtw_select_queue(struct net_device *dev, struct sk_buff *skb
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0) 	
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
+				, struct net_device *sb_dev
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0) 	
 				, void *accel_priv
+#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0) 
 				, select_queue_fallback_t fallback
 #endif
-
-#endif
 )
 {
 	_adapter	*padapter = rtw_netdev_priv(dev);