diff --git a/src/apps/mqtt/mqtt.c b/src/apps/mqtt/mqtt.c
index 878b1d26..b03987cd 100644
--- a/src/apps/mqtt/mqtt.c
+++ b/src/apps/mqtt/mqtt.c
@@ -736,7 +736,7 @@ mqtt_message_received(mqtt_client_t *client, u8_t fixed_hdr_idx, u16_t length, u
       payload_length = length - after_topic;
       payload_offset = after_topic;
 
-      LWIP_DEBUGF(MQTT_DEBUG_TRACE, ("mqtt_incomming_publish: Received message with QoS %d at topic: %s, payload length %d\n",
+      LWIP_DEBUGF(MQTT_DEBUG_TRACE, ("mqtt_incomming_publish: Received message with QoS %d at topic: %s, payload length %"U32_F"\n",
                                      qos, topic, remaining_length + payload_length));
       if (client->pub_cb != NULL) {
         client->pub_cb(client->inpub_arg, (const char *)topic, remaining_length + payload_length);
@@ -829,7 +829,7 @@ mqtt_parse_incoming(mqtt_client_t *client, struct pbuf *p)
       if (fixed_hdr_idx >= 2) {
         msg_rem_len |= (u32_t)(b & 0x7f) << ((fixed_hdr_idx - 2) * 7);
         if ((b & 0x80) == 0) {
-          LWIP_DEBUGF(MQTT_DEBUG_TRACE, ("mqtt_parse_incoming: Remaining length after fixed header: %d\n", msg_rem_len));
+          LWIP_DEBUGF(MQTT_DEBUG_TRACE, ("mqtt_parse_incoming: Remaining length after fixed header: %"U32_F"\n", msg_rem_len));
           if (msg_rem_len == 0) {
             /* Complete message with no extra headers of payload received */
             mqtt_message_received(client, fixed_hdr_idx, 0, 0);
@@ -861,7 +861,7 @@ mqtt_parse_incoming(mqtt_client_t *client, struct pbuf *p)
       in_offset += cpy_len;
       msg_rem_len -= cpy_len;
 
-      LWIP_DEBUGF(MQTT_DEBUG_TRACE, ("mqtt_parse_incoming: msg_idx: %d, cpy_len: %d, remaining %d\n", client->msg_idx, cpy_len, msg_rem_len));
+      LWIP_DEBUGF(MQTT_DEBUG_TRACE, ("mqtt_parse_incoming: msg_idx: %"U32_F", cpy_len: %"U16_F", remaining %"U32_F"\n", client->msg_idx, cpy_len, msg_rem_len));
       if (msg_rem_len == 0 || cpy_len == buffer_space) {
         /* Whole message received or buffer is full */
         mqtt_connection_status_t res = mqtt_message_received(client, fixed_hdr_idx, (cpy_start + cpy_len) - fixed_hdr_idx, msg_rem_len);