diff --git a/drivers/net/wireless/realtek/rtw89/fw.c b/drivers/net/wireless/realtek/rtw89/fw.c
index 2c2fdf21f065..744a8d277cfc 100644
--- a/drivers/net/wireless/realtek/rtw89/fw.c
+++ b/drivers/net/wireless/realtek/rtw89/fw.c
@@ -4965,7 +4965,7 @@ int rtw89_fw_h2c_scan_offload_ax(struct rtw89_dev *rtwdev,
 			scan_mode = RTW89_SCAN_IMMEDIATE;
 		} else {
 			scan_mode = RTW89_SCAN_DELAY;
-			tsf += option->delay * RTW89_SCAN_DELAY_TSF_UNIT;
+			tsf += (u64)option->delay * RTW89_SCAN_DELAY_TSF_UNIT;
 		}
 	}