diff --git a/src/apps/altcp_tls/altcp_tls_mbedtls.c b/src/apps/altcp_tls/altcp_tls_mbedtls.c
index 33bd1218..6a442dad 100644
--- a/src/apps/altcp_tls/altcp_tls_mbedtls.c
+++ b/src/apps/altcp_tls/altcp_tls_mbedtls.c
@@ -152,6 +152,7 @@ static err_t
 altcp_mbedtls_lower_connected(void *arg, struct altcp_pcb *inner_conn, err_t err)
 {
   struct altcp_pcb *conn = (struct altcp_pcb *)arg;
+  LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
   if (conn && conn->state) {
     LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
     /* upper connected is called when handshake is done */
@@ -437,6 +438,7 @@ altcp_mbedtls_bio_recv(void *ctx, unsigned char *buf, size_t len)
   u16_t copy_len;
   err_t err;
 
+  LWIP_UNUSED_ARG(err); /* for LWIP_NOASSERT */
   if ((conn == NULL) || (conn->state == NULL)) {
     return MBEDTLS_ERR_NET_INVALID_CONTEXT;
   }
@@ -484,6 +486,7 @@ static err_t
 altcp_mbedtls_lower_sent(void *arg, struct altcp_pcb *inner_conn, u16_t len)
 {
   struct altcp_pcb *conn = (struct altcp_pcb *)arg;
+  LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
   LWIP_UNUSED_ARG(len);
   if (conn) {
     altcp_mbedtls_state_t *state = (altcp_mbedtls_state_t *)conn->state;
@@ -510,6 +513,7 @@ static err_t
 altcp_mbedtls_lower_poll(void *arg, struct altcp_pcb *inner_conn)
 {
   struct altcp_pcb *conn = (struct altcp_pcb *)arg;
+  LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
   if (conn) {
     LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
     /* check if there's unreceived rx data */
diff --git a/src/apps/http/makefsdata/makefsdata.c b/src/apps/http/makefsdata/makefsdata.c
index f4dbde4e..695e94f5 100644
--- a/src/apps/http/makefsdata/makefsdata.c
+++ b/src/apps/http/makefsdata/makefsdata.c
@@ -536,6 +536,7 @@ static u8_t *get_file_data(const char *filename, int *file_size, int can_be_comp
   u8_t *buf;
   size_t r;
   int rs;
+  LWIP_UNUSED_ARG(r); /* for LWIP_NOASSERT */
   inFile = fopen(filename, "rb");
   if (inFile == NULL) {
     printf("Failed to open file \"%s\"\n", filename);
@@ -629,8 +630,8 @@ static u8_t *get_file_data(const char *filename, int *file_size, int can_be_comp
 static void process_file_data(FILE *data_file, u8_t *file_data, size_t file_size)
 {
   size_t written, i, src_off = 0;
-
   size_t off = 0;
+  LWIP_UNUSED_ARG(written); /* for LWIP_NOASSERT */
   for (i = 0; i < file_size; i++) {
     LWIP_ASSERT("file_buffer_c overflow", off < sizeof(file_buffer_c) - 5);
     sprintf(&file_buffer_c[off], "0x%02x,", file_data[i]);