diff --git a/Makefile b/Makefile
index d21b974..69ad166 100755
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ EXTRA_CFLAGS += -Wno-uninitialized
 EXTRA_CFLAGS += -Wno-cast-function-type
 EXTRA_CFLAGS += -Wno-misleading-indentation
 EXTRA_CFLAGS += -Wno-missing-field-initializers
-EXTRA_CFLAGS += -Wimplicit-fallthrough=0
+EXTRA_CFLAGS += -Wimplicit-fallthrough
 EXTRA_CFLAGS += -Wno-vla -g
 #EXTRA_CFLAGS += -Wno-tautological-compare
 #EXTRA_CFLAGS += -Wno-incompatible-pointer-types
diff --git a/core/rtw_mlme_ext.c b/core/rtw_mlme_ext.c
index c1ccd39..d4e679e 100644
--- a/core/rtw_mlme_ext.c
+++ b/core/rtw_mlme_ext.c
@@ -258,6 +258,7 @@ void rtw_txpwr_init_regd(struct rf_ctl_t *rfctl)
 		);
 		if (rfctl->regd_name)
 			break;
+		// Intentional fallthrough
 	default:
 		rfctl->regd_name = regd_str(TXPWR_LMT_WW);
 		RTW_PRINT("assign %s for default case\n", regd_str(TXPWR_LMT_WW));
@@ -1342,7 +1343,7 @@ void mgt_dispatcher(_adapter *padapter, union recv_frame *precv_frame)
 			ptable->func = &OnAuth;
 		else
 			ptable->func = &OnAuthClient;
-	/* pass through */
+	// Intentional fallthrough
 	case WIFI_ASSOCREQ:
 	case WIFI_REASSOCREQ:
 		_mgt_dispatcher(padapter, ptable, precv_frame);
diff --git a/hal/hal_intf.c b/hal/hal_intf.c
index 2d020fb..c30fa68 100644
--- a/hal/hal_intf.c
+++ b/hal/hal_intf.c
@@ -84,7 +84,7 @@ static void rtw_init_wireless_mode(_adapter *padapter)
 	struct hal_spec_t *hal_spec = GET_HAL_SPEC(padapter);
 	if(hal_spec->proto_cap & PROTO_CAP_11B)
 		proto_wireless_mode |= WIRELESS_11B;
-	
+
 	if(hal_spec->proto_cap & PROTO_CAP_11G)
 		proto_wireless_mode |= WIRELESS_11G;
 #ifdef CONFIG_80211AC_VHT
@@ -103,7 +103,7 @@ static void rtw_init_wireless_mode(_adapter *padapter)
 #endif
 
 #ifdef CONFIG_80211AC_VHT
-	if(hal_spec->proto_cap & PROTO_CAP_11AC) 
+	if(hal_spec->proto_cap & PROTO_CAP_11AC)
 		proto_wireless_mode |= WIRELESS_11AC;
 #endif
 	padapter->registrypriv.wireless_mode &= proto_wireless_mode;
@@ -119,7 +119,7 @@ void rtw_hal_def_value_init(_adapter *padapter)
 		padapter->hal_func.init_default_value(padapter);
 
 		rtw_init_hal_com_default_value(padapter);
-		
+
 		#ifdef CONFIG_FW_MULTI_PORT_SUPPORT
 		adapter_to_dvobj(padapter)->dft.port_id = 0xFF;
 		adapter_to_dvobj(padapter)->dft.mac_id = 0xFF;
@@ -1082,7 +1082,7 @@ s32 c2h_handler(_adapter *adapter, u8 id, u8 seq, u8 plen, u8 *payload)
 	case C2H_EXTEND:
 		sub_id = payload[0];
 		/* no handle, goto default */
-
+		// Intentional fallthrough
 	default:
 		if (phydm_c2H_content_parsing(adapter_to_phydm(adapter), id, plen, payload) != TRUE)
 			ret = _FAIL;
diff --git a/os_dep/linux/ioctl_cfg80211.c b/os_dep/linux/ioctl_cfg80211.c
index e8572a4..bbe9832 100644
--- a/os_dep/linux/ioctl_cfg80211.c
+++ b/os_dep/linux/ioctl_cfg80211.c
@@ -2407,6 +2407,7 @@ static int cfg80211_rtw_change_iface(struct wiphy *wiphy,
 	case NL80211_IFTYPE_P2P_CLIENT:
 		is_p2p = _TRUE;
 	#endif
+	// Intentional fallthrough
 	case NL80211_IFTYPE_STATION:
 		networkType = Ndis802_11Infrastructure;
 
@@ -2431,6 +2432,7 @@ static int cfg80211_rtw_change_iface(struct wiphy *wiphy,
 	case NL80211_IFTYPE_P2P_GO:
 		is_p2p = _TRUE;
 	#endif
+	// Intentional fallthrough
 	case NL80211_IFTYPE_AP:
 		networkType = Ndis802_11APMode;