diff --git a/src/coap_net.c b/src/coap_net.c
index 822f52c2..005f2463 100644
--- a/src/coap_net.c
+++ b/src/coap_net.c
@@ -1747,10 +1747,12 @@ coap_send_internal(coap_session_t *session, coap_pdu_t *pdu) {
 
         if (pdu->used_size + 1 > pdu->max_size) {
           /* No space */
+          coap_delete_pdu(pdu);
           return (coap_mid_t)COAP_DROPPED_RESPONSE;
         }
         if (!coap_pdu_resize(pdu, pdu->used_size + 1)) {
           /* Internal error */
+          coap_delete_pdu(pdu);
           return (coap_mid_t)COAP_DROPPED_RESPONSE;
         }
         data_len = pdu->used_size - (pdu->data - pdu->token);