diff --git a/drivers/staging/rtl8723bs/core/rtw_ap.c b/drivers/staging/rtl8723bs/core/rtw_ap.c
index d572a9bf25ee..a6fcb5e9d637 100644
--- a/drivers/staging/rtl8723bs/core/rtw_ap.c
+++ b/drivers/staging/rtl8723bs/core/rtw_ap.c
@@ -164,8 +164,7 @@ static void update_BCNTIM(struct adapter *padapter)
 	pnetwork_mlmeext->IELength = offset + remainder_ielen;
 }
 
-u8 chk_sta_is_alive(struct sta_info *psta);
-u8 chk_sta_is_alive(struct sta_info *psta)
+static u8 chk_sta_is_alive(struct sta_info *psta)
 {
 	sta_update_last_rx_pkts(psta);