diff --git a/drivers/staging/rtl8723au/core/rtw_mlme.c b/drivers/staging/rtl8723au/core/rtw_mlme.c
index 48b6d4ba3915..b562bd6564a9 100644
--- a/drivers/staging/rtl8723au/core/rtw_mlme.c
+++ b/drivers/staging/rtl8723au/core/rtw_mlme.c
@@ -26,8 +26,6 @@
 #include <wlan_bssdef.h>
 #include <rtw_ioctl_set.h>
 
-extern u8 rtw_do_join23a(struct rtw_adapter * padapter);
-
 static void rtw_init_mlme_timer(struct rtw_adapter *padapter)
 {
 	struct	mlme_priv *pmlmepriv = &padapter->mlmepriv;
diff --git a/drivers/staging/rtl8723au/include/osdep_service.h b/drivers/staging/rtl8723au/include/osdep_service.h
index be9329f14f7a..f2a8d2acf789 100644
--- a/drivers/staging/rtl8723au/include/osdep_service.h
+++ b/drivers/staging/rtl8723au/include/osdep_service.h
@@ -139,6 +139,5 @@ void	_rtw_init_queue23a(struct rtw_queue *pqueue);
 			 ((u32) (a)[2]))
 
 s32 c2h_evt_hdl(struct rtw_adapter *adapter, struct c2h_evt_hdr *c2h_evt, c2h_id_filter filter);
-u8 rtw_do_join23a(struct rtw_adapter *padapter);
 
 #endif
diff --git a/drivers/staging/rtl8723au/include/rtw_ioctl_set.h b/drivers/staging/rtl8723au/include/rtw_ioctl_set.h
index 8e49be5fcdda..e18820012edc 100644
--- a/drivers/staging/rtl8723au/include/rtw_ioctl_set.h
+++ b/drivers/staging/rtl8723au/include/rtw_ioctl_set.h
@@ -29,5 +29,6 @@ u8 rtw_set_802_11_ssid23a(struct rtw_adapter * padapter, struct cfg80211_ssid *
 
 u16 rtw_get_cur_max_rate23a(struct rtw_adapter *adapter);
 s32 FillH2CCmd(struct rtw_adapter *padapter, u8 ElementID, u32 CmdLen, u8 *pCmdBuffer);
+u8 rtw_do_join23a(struct rtw_adapter *padapter);
 
 #endif