diff --git a/test/unit/tcp/tcp_helper.c b/test/unit/tcp/tcp_helper.c
index fc7e67f..aa7c84a 100644
--- a/test/unit/tcp/tcp_helper.c
+++ b/test/unit/tcp/tcp_helper.c
@@ -141,9 +141,18 @@
 tcp_set_state(struct tcp_pcb* pcb, enum tcp_state state, ip_addr_t* local_ip,
                    ip_addr_t* remote_ip, u16_t local_port, u16_t remote_port)
 {
+  u32_t iss;
+
   /* @todo: are these all states? */
   /* @todo: remove from previous list */
   pcb->state = state;
+  
+  iss = tcp_next_iss(pcb);
+  pcb->snd_wl2 = iss;
+  pcb->snd_nxt = iss;
+  pcb->lastack = iss;
+  pcb->snd_lbb = iss;
+  
   if (state == ESTABLISHED) {
     TCP_REG(&tcp_active_pcbs, pcb);
     pcb->local_ip.addr = local_ip->addr;
diff --git a/test/unit/tcp/test_tcp.c b/test/unit/tcp/test_tcp.c
index 8195346..1e5ef03 100644
--- a/test/unit/tcp/test_tcp.c
+++ b/test/unit/tcp/test_tcp.c
@@ -418,7 +418,6 @@
   tcp_ticks = SEQNO1 - ISS;
   pcb = test_tcp_new_counters_pcb(&counters);
   EXPECT_RET(pcb != NULL);
-  EXPECT(pcb->lastack == SEQNO1);
   tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, remote_port);
   pcb->mss = TCP_MSS;
   /* disable initial congestion window (we don't send a SYN here...) */
@@ -517,7 +516,6 @@
   tcp_ticks = SEQNO1 - tcp_next_iss(NULL);
   pcb = test_tcp_new_counters_pcb(&counters);
   EXPECT_RET(pcb != NULL);
-  EXPECT(pcb->lastack == SEQNO1);
   tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, remote_port);
   pcb->mss = TCP_MSS;
   /* disable initial congestion window (we don't send a SYN here...) */