diff --git a/sys/net/application_layer/nanocoap/sock.c b/sys/net/application_layer/nanocoap/sock.c
index ae3375199f64ba8e5c75cda26d71ad9657071263..e77e9e94d31c90223bd59b44c87cd565cdbfb003 100644
--- a/sys/net/application_layer/nanocoap/sock.c
+++ b/sys/net/application_layer/nanocoap/sock.c
@@ -52,7 +52,7 @@ ssize_t nanocoap_request(coap_pkt_t *pkt, sock_udp_ep_t *local, sock_udp_ep_t *r
 
         res = sock_udp_send(&sock, buf, pdu_len, NULL);
         if (res <= 0) {
-            DEBUG("nanocoap: error sending coap request\n");
+            DEBUG("nanocoap: error sending coap request, %d\n", (int)res);
             break;
         }
 
@@ -68,7 +68,7 @@ ssize_t nanocoap_request(coap_pkt_t *pkt, sock_udp_ep_t *local, sock_udp_ep_t *r
                 }
                 continue;
             }
-            DEBUG("nanocoap: error receiving coap request\n");
+            DEBUG("nanocoap: error receiving coap response, %d\n", (int)res);
             break;
         }
         else {