diff --git a/src/mqtt.c b/src/mqtt.c
index cc786dd..740718a 100644
--- a/src/mqtt.c
+++ b/src/mqtt.c
@@ -40,7 +40,7 @@ static void mqtt_broadcast_cmd_id() {
 static void mqtt_cb(struct mg_connection *nc, const char *topic, int topic_len, const char *msg, int msg_len, void *ud) {
   LOG(LL_INFO, ("Received topic='%.*s' msg='%.*s'", topic_len, topic, msg_len, msg));
 
-  if (topic_len >= strlen(MQTT_TOPIC_BROADCAST_CMD) && 0 == strncmp(MQTT_TOPIC_BROADCAST_CMD, topic, strlen(MQTT_TOPIC_BROADCAST_CMD)))
+  if (topic_len >= (int) strlen(MQTT_TOPIC_BROADCAST_CMD) && 0 == strncmp(MQTT_TOPIC_BROADCAST_CMD, topic, strlen(MQTT_TOPIC_BROADCAST_CMD)))
     mqtt_broadcast_cmd_id();
   (void) nc;
   (void) ud;
diff --git a/src/screen.c b/src/screen.c
index aadb6f6..92b0655 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -69,6 +69,7 @@ struct screen_t *screen_create_from_json(char *json, widget_event_fn handler, vo
 exit:
   if (screen_name) free(screen_name);
   return screen;
+  (void) user_data;
 }
 
 void screen_destroy(struct screen_t **s) {
diff --git a/src/widget_default.c b/src/widget_default.c
index ef09b7f..56cc33b 100644
--- a/src/widget_default.c
+++ b/src/widget_default.c
@@ -46,7 +46,6 @@ static void widget_default_draw(struct widget_t *w, uint16_t color) {
 void screen_add_default_widgets(struct screen_t *screen) {
   struct widget_t *w;
   uint16_t screen_width = mgos_ili9341_get_screenWidth();
-  uint16_t screen_height = mgos_ili9341_get_screenHeight();
   if (!screen)
     return;