diff --git a/infra/conf/common.go b/infra/conf/common.go
index ab3cfba7..d2dd56da 100644
--- a/infra/conf/common.go
+++ b/infra/conf/common.go
@@ -358,12 +358,10 @@ func ParseRangeString(str string) (int, int, error) {
 		return 0, 0, nil
 	}
 	// for range value, like "114-514"
-	var pair []string
+	var pair []string = strings.SplitN(str, "-", 2)
 	// Process sth like "-114-514" "-1919--810"
 	if strings.HasPrefix(str, "-") {
 		pair = splitFromSecondDash(str)
-	} else {
-		pair = strings.SplitN(str, "-", 2)
 	}
 	if len(pair) == 2 {
 		left, err := strconv.Atoi(pair[0])