diff --git a/main/ry835ai.go b/main/ry835ai.go
index 42a37f0b..fe34088f 100644
--- a/main/ry835ai.go
+++ b/main/ry835ai.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"log"
+	"os"
 	"strconv"
 	"strings"
 	"sync"