diff --git a/include/coap3/pdu.h b/include/coap3/pdu.h
index a22869b6..8031a1c2 100644
--- a/include/coap3/pdu.h
+++ b/include/coap3/pdu.h
@@ -299,7 +299,6 @@ typedef enum coap_pdu_code_t {
   COAP_REQUEST_CODE_PATCH  = COAP_REQUEST_PATCH,
   COAP_REQUEST_CODE_IPATCH = COAP_REQUEST_IPATCH,
 
-  COAP_RESPONSE_CODE_OK                         = COAP_RESPONSE_CODE(200),
   COAP_RESPONSE_CODE_CREATED                    = COAP_RESPONSE_CODE(201),
   COAP_RESPONSE_CODE_DELETED                    = COAP_RESPONSE_CODE(202),
   COAP_RESPONSE_CODE_VALID                      = COAP_RESPONSE_CODE(203),