diff --git a/drivers/staging/rtl8821ae/rtl8821ae/trx.c b/drivers/staging/rtl8821ae/rtl8821ae/trx.c
index 5f3246454e3e..dd0f6dcb3085 100644
--- a/drivers/staging/rtl8821ae/rtl8821ae/trx.c
+++ b/drivers/staging/rtl8821ae/rtl8821ae/trx.c
@@ -38,7 +38,7 @@
 #include "led.h"
 #include "dm.h"
 
-u8 _rtl8821ae_map_hwqueue_to_fwqueue(struct sk_buff *skb, u8 hw_queue)
+static u8 _rtl8821ae_map_hwqueue_to_fwqueue(struct sk_buff *skb, u8 hw_queue)
 {
 	u16 fc = rtl_get_fc(skb);