diff --git a/dns/client_truncate.go b/dns/client_truncate.go
index f00023f2..19165f99 100644
--- a/dns/client_truncate.go
+++ b/dns/client_truncate.go
@@ -15,8 +15,7 @@ func TruncateDNSMessage(request *dns.Msg, response *dns.Msg, headroom int) (*buf
 	}
 	responseLen := response.Len()
 	if responseLen > maxLen {
-		copyResponse := *response
-		response = &copyResponse
+		response = response.Copy()
 		response.Truncate(maxLen)
 	}
 	buffer := buf.NewSize(headroom*2 + 1 + responseLen)