diff --git a/include/rtw_mlme.h b/include/rtw_mlme.h
index 6205484..669d8f6 100644
--- a/include/rtw_mlme.h
+++ b/include/rtw_mlme.h
@@ -771,13 +771,8 @@ extern void rtw_wmm_event_callback(PADAPTER padapter, u8 *pbuf);
 void rtw_sta_timeout_event_callback(_adapter *adapter, u8 *pbuf);
 #endif /* CONFIG_IEEE80211W */
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
-void rtw_join_timeout_handler(struct timer_list *t);
-void _rtw_scan_timeout_handler(struct timer_list *t);
-#else
 extern void rtw_join_timeout_handler(RTW_TIMER_HDL_ARGS);
 extern void _rtw_scan_timeout_handler(RTW_TIMER_HDL_ARGS);
-#endif
 
 thread_return event_thread(thread_context context);