diff --git a/example/pan_lwip_http_server.c b/example/pan_lwip_http_server.c
index 37126fbae..4374bcb44 100644
--- a/example/pan_lwip_http_server.c
+++ b/example/pan_lwip_http_server.c
@@ -242,7 +242,7 @@ int fs_open_custom(struct fs_file *file, const char *name){
     if (*name != '/') return 0;
     uint32_t file_size = btstack_atoi(&name[1]);
     if (file_size > 0) {
-        printf("Serving '%s' with %u bytes\n", name, file_size);
+        printf("Serving '%s' with %"PRIu32" bytes\n", name, file_size);
         /* initialize fs_file correctly */
         memset(file, 0, sizeof(struct fs_file));
         file->len = file_size;
diff --git a/example/sm_pairing_central.c b/example/sm_pairing_central.c
index dba934874..18b021a48 100644
--- a/example/sm_pairing_central.c
+++ b/example/sm_pairing_central.c
@@ -69,7 +69,7 @@
 #define REMOTE_SERVICE 0x1111
 
 // Fixed passkey - used with sm_pairing_peripheral. Passkey is random in general
-#define FIXED_PASSKEY 123456
+#define FIXED_PASSKEY 123456U
 
 
 static btstack_packet_callback_registration_t hci_event_callback_registration;
@@ -237,7 +237,7 @@ static void sm_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *pa
             break;
         case SM_EVENT_PASSKEY_INPUT_NUMBER:
             printf("Passkey Input requested\n");
-            printf("Sending fixed passkey %"PRIu32"\n", FIXED_PASSKEY);
+            printf("Sending fixed passkey %"PRIu32"\n", (uint32_t) FIXED_PASSKEY);
             sm_passkey_input(sm_event_passkey_input_number_get_handle(packet), FIXED_PASSKEY);
             break;
         case SM_EVENT_PAIRING_COMPLETE:
diff --git a/src/classic/a2dp_source.c b/src/classic/a2dp_source.c
index ee31d8d81..4a8b7e674 100644
--- a/src/classic/a2dp_source.c
+++ b/src/classic/a2dp_source.c
@@ -741,7 +741,7 @@ uint8_t a2dp_source_reconfigure_stream_sampling_frequency(uint16_t avdtp_cid, ui
             config |= (AVDTP_SBC_16000 << 4);
             break;
         default:
-            log_error("Unsupported sampling frequency %u", sampling_frequency);
+            log_error("Unsupported sampling frequency %u", (int) sampling_frequency);
             return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE;
     }
     sc.local_stream_endpoint->media_codec_sbc_info[0] = config;
diff --git a/src/classic/hfp_ag.c b/src/classic/hfp_ag.c
index 897630964..5110a604a 100644
--- a/src/classic/hfp_ag.c
+++ b/src/classic/hfp_ag.c
@@ -1861,17 +1861,17 @@ static void hfp_ag_handle_rfcomm_data(uint8_t packet_type, uint16_t channel, uin
                             hfp_connection->send_error = 1;
                             return;
                         }
-                        log_info("HF Indicator 'enhanced security' set to %u", hfp_connection->parser_indicator_value);
+                        log_info("HF Indicator 'enhanced security' set to %u", (unsigned int) hfp_connection->parser_indicator_value);
                         break;
                     case 2: // battery level
                         if (hfp_connection->parser_indicator_value > 100){
                             hfp_connection->send_error = 1;
                             return;
                         }
-                        log_info("HF Indicator 'battery' set to %u", hfp_connection->parser_indicator_value);
+                        log_info("HF Indicator 'battery' set to %u", (unsigned int) hfp_connection->parser_indicator_value);
                         break;
                     default:
-                        log_info("HF Indicator unknown set to %u", hfp_connection->parser_indicator_value);
+                        log_info("HF Indicator unknown set to %u", (unsigned int) hfp_connection->parser_indicator_value);
                         break;
                 }
                 hfp_connection->ok_pending = 1;
diff --git a/src/l2cap.c b/src/l2cap.c
index cbe8a3cb6..e74b3e2db 100644
--- a/src/l2cap.c
+++ b/src/l2cap.c
@@ -4005,7 +4005,7 @@ static void l2cap_sm_packet_handler(uint8_t packet_type, uint16_t channel_nr, ui
     UNUSED(channel_nr);
     UNUSED(size);
     UNUSED(packet_type);
-    btstack_assert(packet_type = HCI_EVENT_PACKET);
+    btstack_assert(packet_type == HCI_EVENT_PACKET);
     if (hci_event_packet_get_type(packet) != SM_EVENT_PAIRING_COMPLETE) return;
     hci_con_handle_t con_handle = sm_event_pairing_complete_get_handle(packet);
     btstack_linked_list_iterator_t it;