diff --git a/common/sniff/dns.go b/common/sniff/dns.go
index 96670eca..4eb1990c 100644
--- a/common/sniff/dns.go
+++ b/common/sniff/dns.go
@@ -11,7 +11,6 @@ import (
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/buf"
-	M "github.com/sagernet/sing/common/metadata"
 	"github.com/sagernet/sing/common/task"
 
 	mDNS "github.com/miekg/dns"
@@ -47,9 +46,6 @@ func DomainNameQuery(ctx context.Context, metadata *adapter.InboundContext, pack
 	if err != nil {
 		return err
 	}
-	if len(msg.Question) == 0 || msg.Question[0].Qclass != mDNS.ClassINET || !M.IsDomainName(msg.Question[0].Name) {
-		return os.ErrInvalid
-	}
 	metadata.Protocol = C.ProtocolDNS
 	return nil
 }
diff --git a/common/sniff/dns_test.go b/common/sniff/dns_test.go
new file mode 100644
index 00000000..eaf4dd1a
--- /dev/null
+++ b/common/sniff/dns_test.go
@@ -0,0 +1,23 @@
+package sniff_test
+
+import (
+	"context"
+	"encoding/hex"
+	"testing"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/sniff"
+	C "github.com/sagernet/sing-box/constant"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestSniffDNS(t *testing.T) {
+	t.Parallel()
+	query, err := hex.DecodeString("740701000001000000000000012a06676f6f676c6503636f6d0000010001")
+	require.NoError(t, err)
+	var metadata adapter.InboundContext
+	err = sniff.DomainNameQuery(context.TODO(), &metadata, query)
+	require.NoError(t, err)
+	require.Equal(t, C.ProtocolDNS, metadata.Protocol)
+}