diff --git a/sys/include/net/coap.h b/sys/include/net/coap.h
index dca1f4bae0..b675f653b1 100644
--- a/sys/include/net/coap.h
+++ b/sys/include/net/coap.h
@@ -443,6 +443,11 @@ extern "C" {
  * @see     [Web of Things (WoT) Thing Description 1.1](https://www.w3.org/TR/wot-thing-description11/)
  */
 #define COAP_FORMAT_TM_JSON                 (433)
+/**
+ * @brief   Content-Type `application/dns-message`
+ * @see     [draft-ietf-core-dns-over-coap](https://datatracker.ietf.org/doc/draft-ietf-core-dns-over-coap/)
+ */
+#define COAP_FORMAT_DNS_MESSAGE             (553)
 /**
  * @brief   Content-Type `application/voucher-cose+cbor`
  * @see     [draft-ietf-anima-constrained-voucher](https://datatracker.ietf.org/doc/draft-ietf-anima-constrained-voucher/)
@@ -500,7 +505,6 @@ extern "C" {
  * @see     [RFC 2318](https://www.w3.org/TR/SVG/mimereg.html)
  */
 #define COAP_FORMAT_IMAGE_SVG_XML         (30000)
-#define COAP_FORMAT_DNS_MESSAGE           (65053)       /**< NON STANDARD! */
 /** @} */
 
 /**