diff --git a/app/router/config.go b/app/router/config.go
index d87ec3b5cb8..07931711fea 100644
--- a/app/router/config.go
+++ b/app/router/config.go
@@ -77,6 +77,8 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 			}
 			newError("ACAutomatonDomainMatcher is enabled for ", len(rr.Domain), "domain rules(s)").AtDebug().WriteToLog()
 			conds.Add(matcher)
+		case "linear":
+			fallthrough
 		default:
 			matcher, err := NewDomainMatcher(rr.Domain)
 			if err != nil {