diff --git a/tpws/helpers.c b/tpws/helpers.c
index afdcc44..3ee8fd1 100644
--- a/tpws/helpers.c
+++ b/tpws/helpers.c
@@ -12,10 +12,6 @@
 #include <libgen.h>
 #include <unistd.h>
 
-#ifdef __linux__
-#include <linux/tcp.h>
-#endif
-
 #ifdef __ANDROID__
 #include "andr/ifaddrs.h"
 #else
@@ -23,6 +19,7 @@
 #endif
 
 #include "helpers.h"
+#include "linux_compat.h"
 
 int unique_size_t(size_t *pu, int ct)
 {
@@ -481,7 +478,7 @@ void msleep(unsigned int ms)
 bool socket_supports_notsent()
 {
 	int sfd;
-	struct tcp_info tcpi;
+	union my_tcp_info tcpi;
 
 	sfd = socket(AF_INET,SOCK_STREAM,0);
 	if (sfd<0) return false;
@@ -494,22 +491,22 @@ bool socket_supports_notsent()
 	}
 	close(sfd);
 
-	return ts>=((char *)&tcpi.tcpi_notsent_bytes - (char *)&tcpi.tcpi_state + sizeof(tcpi.tcpi_notsent_bytes));
+	return ts>=((char *)&tcpi.ti.tcpi_notsent_bytes - (char *)&tcpi.ti + sizeof(tcpi.ti.tcpi_notsent_bytes));
 }
 bool socket_has_notsent(int sfd)
 {
-	struct tcp_info tcpi;
+	union my_tcp_info tcpi;
 	socklen_t ts = sizeof(tcpi);
 
 	if (getsockopt(sfd, IPPROTO_TCP, TCP_INFO, (char *)&tcpi, &ts) < 0)
 		return false;
-	if (tcpi.tcpi_state != 1) // TCP_ESTABLISHED
+	if (tcpi.ti.tcpi_state != 1) // TCP_ESTABLISHED
 		return false;
-	size_t s = (char *)&tcpi.tcpi_notsent_bytes - (char *)&tcpi + sizeof(tcpi.tcpi_notsent_bytes);
+	size_t s = (char *)&tcpi.ti.tcpi_notsent_bytes - (char *)&tcpi.ti + sizeof(tcpi.ti.tcpi_notsent_bytes);
 	if (ts < s)
 		// old structure version
 		return false;
-	return !!tcpi.tcpi_notsent_bytes;
+	return !!tcpi.ti.tcpi_notsent_bytes;
 }
 bool socket_wait_notsent(int sfd, unsigned int delay_ms, unsigned int *wasted_ms)
 {
diff --git a/tpws/linux_compat.h b/tpws/linux_compat.h
new file mode 100644
index 0000000..e06114e
--- /dev/null
+++ b/tpws/linux_compat.h
@@ -0,0 +1,105 @@
+#ifdef __linux__
+
+#include <linux/tcp.h>
+
+// workaround for old headers
+
+struct tcp_info_new {
+	__u8    tcpi_state;
+	__u8    tcpi_ca_state;
+	__u8    tcpi_retransmits;
+	__u8    tcpi_probes;
+	__u8    tcpi_backoff;
+	__u8    tcpi_options;
+	__u8    tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
+	__u8    tcpi_delivery_rate_app_limited : 1, tcpi_fastopen_client_fail : 2;
+
+	__u32   tcpi_rto;
+	__u32   tcpi_ato;
+	__u32   tcpi_snd_mss;
+	__u32   tcpi_rcv_mss;
+
+	__u32   tcpi_unacked;
+	__u32   tcpi_sacked;
+	__u32   tcpi_lost;
+	__u32   tcpi_retrans;
+	__u32   tcpi_fackets;
+
+	/* Times. */
+	__u32   tcpi_last_data_sent;
+	__u32   tcpi_last_ack_sent;     /* Not remembered, sorry. */
+	__u32   tcpi_last_data_recv;
+	__u32   tcpi_last_ack_recv;
+
+	/* Metrics. */
+	__u32   tcpi_pmtu;
+	__u32   tcpi_rcv_ssthresh;
+	__u32   tcpi_rtt;
+	__u32   tcpi_rttvar;
+	__u32   tcpi_snd_ssthresh;
+	__u32   tcpi_snd_cwnd;
+	__u32   tcpi_advmss;
+	__u32   tcpi_reordering;
+
+	__u32   tcpi_rcv_rtt;
+	__u32   tcpi_rcv_space;
+
+	__u32   tcpi_total_retrans;
+
+	__u64   tcpi_pacing_rate;
+	__u64   tcpi_max_pacing_rate;
+	__u64   tcpi_bytes_acked;    /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
+	__u64   tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
+	__u32   tcpi_segs_out;       /* RFC4898 tcpEStatsPerfSegsOut */
+	__u32   tcpi_segs_in;        /* RFC4898 tcpEStatsPerfSegsIn */
+
+	__u32   tcpi_notsent_bytes;
+	__u32   tcpi_min_rtt;
+	__u32   tcpi_data_segs_in;      /* RFC4898 tcpEStatsDataSegsIn */
+	__u32   tcpi_data_segs_out;     /* RFC4898 tcpEStatsDataSegsOut */
+
+	__u64   tcpi_delivery_rate;
+
+	__u64   tcpi_busy_time;      /* Time (usec) busy sending data */
+	__u64   tcpi_rwnd_limited;   /* Time (usec) limited by receive window */
+	__u64   tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
+
+	__u32   tcpi_delivered;
+	__u32   tcpi_delivered_ce;
+
+	__u64   tcpi_bytes_sent;     /* RFC4898 tcpEStatsPerfHCDataOctetsOut */
+	__u64   tcpi_bytes_retrans;  /* RFC4898 tcpEStatsPerfOctetsRetrans */
+	__u32   tcpi_dsack_dups;     /* RFC4898 tcpEStatsStackDSACKDups */
+	__u32   tcpi_reord_seen;     /* reordering events seen */
+
+	__u32   tcpi_rcv_ooopack;    /* Out-of-order packets received */
+
+	__u32   tcpi_snd_wnd;        /* peer's advertised receive window after
+								  * scaling (bytes)
+								  */
+	__u32   tcpi_rcv_wnd;        /* local advertised receive window after
+								  * scaling (bytes)
+								  */
+
+	__u32   tcpi_rehash;         /* PLB or timeout triggered rehash attempts */
+
+	__u16   tcpi_total_rto; /* Total number of RTO timeouts, including
+							 * SYN/SYN-ACK and recurring timeouts.
+							 */
+	__u16   tcpi_total_rto_recoveries;      /* Total number of RTO
+											 * recoveries, including any
+											 * unfinished recovery.
+											 */
+	__u32   tcpi_total_rto_time;    /* Total time spent in RTO recoveries
+									 * in milliseconds, including any
+									 * unfinished recovery.
+									 */
+};
+
+union my_tcp_info
+{
+	struct tcp_info ti_native;
+	struct tcp_info_new ti;
+};
+
+#endif
diff --git a/tpws/params.h b/tpws/params.h
index 52022d8..67a357b 100644
--- a/tpws/params.h
+++ b/tpws/params.h
@@ -18,7 +18,7 @@
 #define HOSTLIST_AUTO_FAIL_THRESHOLD_DEFAULT	3
 #define	HOSTLIST_AUTO_FAIL_TIME_DEFAULT 	60
 
-#define FIX_SEG_DEFAULT_MAX_WAIT		30
+#define FIX_SEG_DEFAULT_MAX_WAIT		50
 
 enum bindll { unwanted=0, no, prefer, force };