diff --git a/criu/sk-tcp.c b/criu/sk-tcp.c
index 20ea528bb..5fe93ab0a 100644
--- a/criu/sk-tcp.c
+++ b/criu/sk-tcp.c
@@ -113,8 +113,10 @@ static int dump_tcp_conn_state(struct inet_sk_desc *sk)
 	struct libsoccr_sk_data data;
 
 	ret = libsoccr_save(socr, &data, sizeof(data));
-	if (ret < 0)
+	if (ret < 0) {
+		pr_err("libsoccr_save() failed with %d\n", ret);
 		goto err_r;
+	}
 	if (ret != sizeof(data)) {
 		pr_err("This libsocr is not supported (%d vs %d)\n",
 				ret, (int)sizeof(data));
diff --git a/soccr/soccr.c b/soccr/soccr.c
index 583f1eaaa..48469aaab 100644
--- a/soccr/soccr.c
+++ b/soccr/soccr.c
@@ -374,10 +374,10 @@ int libsoccr_save(struct libsoccr_sk *sk, struct libsoccr_sk_data *data, unsigne
 	sk->flags |= SK_FLAG_FREE_SQ | SK_FLAG_FREE_RQ;
 
 	if (get_queue(sk->fd, TCP_RECV_QUEUE, &data->inq_seq, data->inq_len, &sk->recv_queue))
-		return -4;
+		return -5;
 
 	if (get_queue(sk->fd, TCP_SEND_QUEUE, &data->outq_seq, data->outq_len, &sk->send_queue))
-		return -5;
+		return -6;
 
 	return sizeof(struct libsoccr_sk_data);
 }