diff --git a/include/rtw_version.h b/include/rtw_version.h
index 1780abe..8c35ee9 100644
--- a/include/rtw_version.h
+++ b/include/rtw_version.h
@@ -1 +1 @@
-#define DRIVERVERSION	"v5.2.20.2_28373.20180619"
+#define DRIVERVERSION	"v5.2.20.2_28373.20190919"
diff --git a/os_dep/linux/ioctl_cfg80211.c b/os_dep/linux/ioctl_cfg80211.c
index 36c278a..4e108fe 100644
--- a/os_dep/linux/ioctl_cfg80211.c
+++ b/os_dep/linux/ioctl_cfg80211.c
@@ -4165,6 +4165,9 @@ static int rtw_cfg80211_add_monitor_if(_adapter *padapter, char *name, struct ne
 		ret = -ENOMEM;
 		goto out;
 	}
+	mon_ndev->min_mtu = WLAN_MIN_ETHFRM_LEN;
+	mon_ndev->mtu = WLAN_DATA_MAXLEN;
+	mon_ndev->max_mtu = WLAN_DATA_MAXLEN;
 
 	mon_ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 	strncpy(mon_ndev->name, name, IFNAMSIZ);
diff --git a/os_dep/linux/os_intfs.c b/os_dep/linux/os_intfs.c
index f75ca82..f0fe633 100644
--- a/os_dep/linux/os_intfs.c
+++ b/os_dep/linux/os_intfs.c
@@ -1477,6 +1477,10 @@ struct net_device *rtw_init_netdev(_adapter *old_padapter)
 	if (!pnetdev)
 		return NULL;
 
+	pnetdev->min_mtu = WLAN_MIN_ETHFRM_LEN;
+	pnetdev->mtu = WLAN_DATA_MAXLEN;
+	pnetdev->max_mtu = WLAN_DATA_MAXLEN;
+
 	padapter = rtw_netdev_priv(pnetdev);
 	padapter->pnetdev = pnetdev;
 
diff --git a/os_dep/osdep_service.c b/os_dep/osdep_service.c
index 6949fba..d333b1f 100644
--- a/os_dep/osdep_service.c
+++ b/os_dep/osdep_service.c
@@ -2059,6 +2059,10 @@ struct net_device *rtw_alloc_etherdev_with_old_priv(int sizeof_priv, void *old_p
 	if (!pnetdev)
 		goto RETURN;
 
+	pnetdev->min_mtu = WLAN_MIN_ETHFRM_LEN;
+	pnetdev->mtu = WLAN_MAX_ETHFRM_LEN;
+	pnetdev->max_mtu = WLAN_DATA_MAXLEN;
+
 	pnpi = netdev_priv(pnetdev);
 	pnpi->priv = old_priv;
 	pnpi->sizeof_priv = sizeof_priv;
@@ -2080,6 +2084,10 @@ struct net_device *rtw_alloc_etherdev(int sizeof_priv)
 	if (!pnetdev)
 		goto RETURN;
 
+	pnetdev->min_mtu = WLAN_MIN_ETHFRM_LEN;
+	pnetdev->mtu = WLAN_MAX_ETHFRM_LEN;
+	pnetdev->max_mtu = WLAN_DATA_MAXLEN;
+
 	pnpi = netdev_priv(pnetdev);
 
 	pnpi->priv = rtw_zvmalloc(sizeof_priv);