diff --git a/doh-client/google.go b/doh-client/google.go
index d985e8a..e1c2241 100644
--- a/doh-client/google.go
+++ b/doh-client/google.go
@@ -48,7 +48,7 @@ func (c *Client) handlerFuncGoogle(w dns.ResponseWriter, r *dns.Msg, isTCP bool)
 		w.WriteMsg(reply)
 		return
 	}
-	question := r.Question[0]
+	question := &r.Question[0]
 	// knot-resolver scrambles capitalization, I think it is unfriendly to cache
 	questionName := strings.ToLower(question.Name)
 	questionType := ""
diff --git a/doh-client/ietf.go b/doh-client/ietf.go
index 33b69b7..c78f745 100644
--- a/doh-client/ietf.go
+++ b/doh-client/ietf.go
@@ -49,7 +49,7 @@ func (c *Client) handlerFuncIETF(w dns.ResponseWriter, r *dns.Msg, isTCP bool) {
 		return
 	}
 
-	question := r.Question[0]
+	question := &r.Question[0]
 	// knot-resolver scrambles capitalization, I think it is unfriendly to cache
 	questionName := strings.ToLower(question.Name)
 	questionType := ""
diff --git a/doh-server/ietf.go b/doh-server/ietf.go
index 2bede2d..fec2c6f 100644
--- a/doh-server/ietf.go
+++ b/doh-server/ietf.go
@@ -70,7 +70,7 @@ func (s *Server) parseRequestIETF(w http.ResponseWriter, r *http.Request) *DNSRe
 	}
 
 	if s.conf.Verbose && len(msg.Question) > 0 {
-		question := msg.Question[0]
+		question := &msg.Question[0]
 		questionName := question.Name
 		questionClass := ""
 		if qclass, ok := dns.ClassToString[question.Qclass]; ok {