diff --git a/src/api/api_msg.c b/src/api/api_msg.c
index 614ca641..39531024 100644
--- a/src/api/api_msg.c
+++ b/src/api/api_msg.c
@@ -300,6 +300,7 @@ recv_tcp(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
   LWIP_ASSERT("recv_tcp must have a pcb argument", pcb != NULL);
   LWIP_ASSERT("recv_tcp must have an argument", arg != NULL);
   LWIP_ASSERT("err != ERR_OK unhandled", err == ERR_OK);
+  LWIP_UNUSED_ARG(err); /* for LWIP_NOASSERT */
   conn = (struct netconn *)arg;
 
   if (conn == NULL) {
diff --git a/src/apps/http/altcp_proxyconnect.c b/src/apps/http/altcp_proxyconnect.c
index 6ce56a43..7a4b6b6c 100644
--- a/src/apps/http/altcp_proxyconnect.c
+++ b/src/apps/http/altcp_proxyconnect.c
@@ -161,6 +161,7 @@ altcp_proxyconnect_lower_connected(void *arg, struct altcp_pcb *inner_conn, err_
   struct altcp_pcb *conn = (struct altcp_pcb *)arg;
   if (conn && conn->state) {
     LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
+    LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
     /* upper connected is called when handshake is done */
     if (err != ERR_OK) {
       if (conn->connected) {
@@ -252,6 +253,7 @@ altcp_proxyconnect_lower_sent(void *arg, struct altcp_pcb *inner_conn, u16_t len
   if (conn) {
     altcp_proxyconnect_state_t *state = (altcp_proxyconnect_state_t *)conn->state;
     LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
+    LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
     if (!state || !(state->flags & ALTCP_PROXYCONNECT_FLAGS_HANDSHAKE_DONE)) {
       /* @todo: do something here? */
       return ERR_OK;
@@ -274,6 +276,7 @@ altcp_proxyconnect_lower_poll(void *arg, struct altcp_pcb *inner_conn)
   struct altcp_pcb *conn = (struct altcp_pcb *)arg;
   if (conn) {
     LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
+    LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
     if (conn->poll) {
       return conn->poll(conn->arg, conn);
     }
diff --git a/src/apps/lwiperf/lwiperf.c b/src/apps/lwiperf/lwiperf.c
index 1af2de7d..72193781 100644
--- a/src/apps/lwiperf/lwiperf.c
+++ b/src/apps/lwiperf/lwiperf.c
@@ -522,6 +522,7 @@ lwiperf_tcp_recv(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err)
     conn->next_num = 4; /* 24 bytes received... */
     tmp = pbuf_remove_header(p, 24);
     LWIP_ASSERT("pbuf_remove_header failed", tmp == 0);
+    LWIP_UNUSED_ARG(tmp); /* for LWIP_NOASSERT */
   }
 
   packet_idx = 0;
diff --git a/src/core/altcp_tcp.c b/src/core/altcp_tcp.c
index ce2caa3a..b715f045 100644
--- a/src/core/altcp_tcp.c
+++ b/src/core/altcp_tcp.c
@@ -53,9 +53,12 @@
 
 #include <string.h>
 
-#define ALTCP_TCP_ASSERT_CONN(conn) LWIP_ASSERT("conn->inner_conn == NULL", (conn)->inner_conn == NULL)
+#define ALTCP_TCP_ASSERT_CONN(conn) do { \
+  LWIP_ASSERT("conn->inner_conn == NULL", (conn)->inner_conn == NULL); \
+  LWIP_UNUSED_ARG(conn); /* for LWIP_NOASSERT */ } while(0)
 #define ALTCP_TCP_ASSERT_CONN_PCB(conn, tpcb) do { \
   LWIP_ASSERT("pcb mismatch", (conn)->state == tpcb); \
+  LWIP_UNUSED_ARG(tpcb); /* for LWIP_NOASSERT */ \
   ALTCP_TCP_ASSERT_CONN(conn); } while(0)
 
 
diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index f821892f..c862b7cc 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -1907,6 +1907,8 @@ tcp_output_fill_options(const struct tcp_pcb *pcb, struct pbuf *p, u8_t optflags
   LWIP_UNUSED_ARG(pcb);
   LWIP_UNUSED_ARG(sacks_len);
   LWIP_ASSERT("options not filled", (u8_t *)opts == ((u8_t *)(tcphdr + 1)) + sacks_len * 4 + LWIP_TCP_OPT_LENGTH_SEGMENT(optflags, pcb));
+  LWIP_UNUSED_ARG(optflags); /* for LWIP_NOASSERT */
+  LWIP_UNUSED_ARG(opts); /* for LWIP_NOASSERT */
 }
 
 /** Output a control segment pbuf to IP.
diff --git a/src/netif/zepif.c b/src/netif/zepif.c
index 3f8d59b8..8793c050 100644
--- a/src/netif/zepif.c
+++ b/src/netif/zepif.c
@@ -114,6 +114,7 @@ zepif_udp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p,
 
   LWIP_ASSERT("arg != NULL", arg != NULL);
   LWIP_ASSERT("pcb != NULL", pcb != NULL);
+  LWIP_UNUSED_ARG(pcb); /* for LWIP_NOASSERT */
   LWIP_UNUSED_ARG(addr);
   LWIP_UNUSED_ARG(port);
   if (p == NULL) {