diff --git a/Makefile b/Makefile
index b13e07a..b24502f 100755
--- a/Makefile
+++ b/Makefile
@@ -1,29 +1,14 @@
 EXTRA_CFLAGS += $(USER_EXTRA_CFLAGS) -fno-pie
 EXTRA_CFLAGS += -O1
 #EXTRA_CFLAGS += -O3
-#EXTRA_CFLAGS += -Wall
-#EXTRA_CFLAGS += -Wextra
-#EXTRA_CFLAGS += -Werror
-#EXTRA_CFLAGS += -pedantic
-#EXTRA_CFLAGS += -Wshadow -Wpointer-arith -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
 EXTRA_CFLAGS += -Wno-unused-variable
 EXTRA_CFLAGS += -Wno-unused-value
 EXTRA_CFLAGS += -Wno-unused-label
 EXTRA_CFLAGS += -Wno-unused-parameter
 EXTRA_CFLAGS += -Wno-unused-function
 EXTRA_CFLAGS += -Wno-unused
-#EXTRA_CFLAGS += -Wno-uninitialized
 EXTRA_CFLAGS += -Wno-vla
-#EXTRA_CFLAGS += -Wno-cast-function-type
 EXTRA_CFLAGS += -Wno-date-time
-#EXTRA_CFLAGS += -Wno-misleading-indentation
-#EXTRA_CFLAGS += -Wno-uninitialized
-# Relax some warnings from '-Wextra' so we won't get flooded with warnings
-#EXTRA_CFLAGS += -Wno-sign-compare
-#EXTRA_CFLAGS += -Wno-missing-field-initializers
-#EXTRA_CFLAGS += -Wno-type-limits
-EXTRA_CFLAGS += -Wno-implicit-fallthrough
-EXTRA_CFLAGS += -Wno-maybe-uninitialized
 
 GCC_VER_49 := $(shell echo `$(CC) -dumpversion | cut -f1-2 -d.` \>= 4.9 | bc )
 ifeq ($(GCC_VER_49),1)
diff --git a/core/rtw_mlme_ext.c b/core/rtw_mlme_ext.c
index 68dc9d2..da471c1 100644
--- a/core/rtw_mlme_ext.c
+++ b/core/rtw_mlme_ext.c
@@ -1831,7 +1831,11 @@ void mgt_dispatcher(_adapter *padapter, union recv_frame *precv_frame)
 			ptable->func = &OnAuth;
 		else
 			ptable->func = &OnAuthClient;
-	/* pass through */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
+	__attribute__ ((fallthrough));
+#else
+			__attribute__ ((__fallthrough__));
+#endif
 	case WIFI_ASSOCREQ:
 	case WIFI_REASSOCREQ:
 		_mgt_dispatcher(padapter, ptable, precv_frame);
diff --git a/dkms.conf b/dkms.conf
index 61181ea..a6d88b0 100644
--- a/dkms.conf
+++ b/dkms.conf
@@ -1,5 +1,5 @@
 PACKAGE_NAME="realtek-rtl8188eus"
-PACKAGE_VERSION="5.3.9~20200112"
+PACKAGE_VERSION="5.3.9~20200124"
 CLEAN="'make' clean"
 BUILT_MODULE_NAME[0]=8188eu
 PROCS_NUM=`nproc`
diff --git a/hal/hal_intf.c b/hal/hal_intf.c
index d818bc8..95966c8 100644
--- a/hal/hal_intf.c
+++ b/hal/hal_intf.c
@@ -939,7 +939,7 @@ s32 c2h_handler(_adapter *adapter, u8 id, u8 seq, u8 plen, u8 *payload)
 #endif
 	case C2H_EXTEND:
 		sub_id = payload[0];
-		/* no handle, goto default */
+		__attribute__ ((__fallthrough__));
 
 	default:
 		if (phydm_c2H_content_parsing(adapter_to_phydm(adapter), id, plen, payload) != TRUE)
diff --git a/os_dep/linux/ioctl_cfg80211.c b/os_dep/linux/ioctl_cfg80211.c
index c2461a3..50ffdf9 100644
--- a/os_dep/linux/ioctl_cfg80211.c
+++ b/os_dep/linux/ioctl_cfg80211.c
@@ -2367,6 +2367,7 @@ static int cfg80211_rtw_change_iface(struct wiphy *wiphy,
 	case NL80211_IFTYPE_P2P_CLIENT:
 		is_p2p = _TRUE;
 	#endif
+	__attribute__ ((__fallthrough__));
 	case NL80211_IFTYPE_STATION:
 		networkType = Ndis802_11Infrastructure;
 
@@ -2391,6 +2392,7 @@ static int cfg80211_rtw_change_iface(struct wiphy *wiphy,
 	case NL80211_IFTYPE_P2P_GO:
 		is_p2p = _TRUE;
 	#endif
+	__attribute__ ((__fallthrough__));
 	case NL80211_IFTYPE_AP:
 		networkType = Ndis802_11APMode;