diff --git a/examples/stm32/nucleo-h743zi-make-baremetal-builtin/Makefile b/examples/stm32/nucleo-h743zi-make-baremetal-builtin/Makefile
index 45df45e7..d5ea6335 100644
--- a/examples/stm32/nucleo-h743zi-make-baremetal-builtin/Makefile
+++ b/examples/stm32/nucleo-h743zi-make-baremetal-builtin/Makefile
@@ -59,4 +59,4 @@ test: update
 #	grep 'MQTT connected' /tmp/output.txt   # Check for MQTT connection success
 
 clean:
-	$(RM) firmware.* *.su cmsis_core cmsis_h7
+	$(RM) firmware.* *.su cmsis_core cmsis_h7 mbedtls
diff --git a/test/unit_test.c b/test/unit_test.c
index 17dd956b..aebbbfd0 100644
--- a/test/unit_test.c
+++ b/test/unit_test.c
@@ -1183,10 +1183,10 @@ static void test_http_404(void) {
 
 static void test_tls(void) {
 #if MG_TLS
-  struct mg_tls_opts opts = {};
-  opts.client_ca = s_tls_ca;
-  opts.server_cert = s_tls_cert;
-  opts.server_key = s_tls_key;
+  struct mg_tls_opts opts = {0};
+  opts.client_ca = mg_str(s_tls_ca);
+  opts.server_cert = mg_str(s_tls_cert);
+  opts.server_key = mg_str(s_tls_key);
   struct mg_mgr mgr;
   struct mg_connection *c;
   const char *url = "https://127.0.0.1:12347";
@@ -1242,7 +1242,6 @@ static void test_http_client(void) {
 #if MG_TLS
   {
     const char *url = "https://cesanta.com";
-    struct mg_str host = mg_url_host(url);
     c = mg_http_connect(&mgr, url, f3, &ok);
     ASSERT(c != NULL);
     for (i = 0; i < 1500 && ok <= 0; i++) mg_mgr_poll(&mgr, 1000);