diff --git a/wled00/FX_fcn.cpp b/wled00/FX_fcn.cpp
index db8d5a308f..f7e0a14d61 100644
--- a/wled00/FX_fcn.cpp
+++ b/wled00/FX_fcn.cpp
@@ -1495,7 +1495,7 @@ void WS2812FX::finalizeInit() {
   DEBUG_PRINTF_P(PSTR("LED buffer size: %uB/%uB\n"), mem, BusManager::memUsage());
 
   _length = 0;
-  for (int i=0; i<BusManager::getNumBusses(); i++) {
+  for (size_t i=0; i<BusManager::getNumBusses(); i++) {
     Bus *bus = BusManager::getBus(i);
     if (!bus || !bus->isOk() || bus->getStart() + bus->getLength() > MAX_LEDS) break;
     //RGBW mode is enabled if at least one of the strips is RGBW
diff --git a/wled00/network.cpp b/wled00/network.cpp
index 79209ff5e9..2dd1cbccf3 100644
--- a/wled00/network.cpp
+++ b/wled00/network.cpp
@@ -296,7 +296,7 @@ int findWiFi(bool doScan) {
   } else if (status >= 0) {   // status contains number of found networks (including duplicate SSIDs with different BSSID)
     DEBUG_PRINTF_P(PSTR("WiFi: Found %d SSIDs. @ %lus\n"), status, millis()/1000);
     int rssi = -9999;
-    int selected = selectedWiFi;
+    size_t selected = selectedWiFi;
     for (int o = 0; o < status; o++) {
       DEBUG_PRINTF_P(PSTR(" SSID: %s (BSSID: %s) RSSI: %ddB\n"), WiFi.SSID(o).c_str(), WiFi.BSSIDstr(o).c_str(), WiFi.RSSI(o));
       for (unsigned n = 0; n < multiWiFi.size(); n++)
diff --git a/wled00/wled.cpp b/wled00/wled.cpp
index cc338d23f2..ab25c91fde 100644
--- a/wled00/wled.cpp
+++ b/wled00/wled.cpp
@@ -750,7 +750,7 @@ void WLED::handleConnection()
   static bool scanDone = true;
   static byte stacO = 0;
   const unsigned long now = millis();
-  const unsigned long nowS = now/1000;
+  const unsigned long __attribute__((unused)) nowS = now/1000;
   const bool wifiConfigured = WLED_WIFI_CONFIGURED;
 
   // ignore connection handling if WiFi is configured and scan still running
diff --git a/wled00/wled.h b/wled00/wled.h
index 8926967ff9..5ead106b4f 100644
--- a/wled00/wled.h
+++ b/wled00/wled.h
@@ -367,7 +367,7 @@ WLED_GLOBAL wifi_options_t wifiOpt _INIT_N(({0, 1, false, AP_BEHAVIOR_BOOT_NO_CO
 #define noWifiSleep  wifiOpt.noWifiSleep
 #define force802_3g  wifiOpt.force802_3g
 #else
-WLED_GLOBAL int8_t selectedWiFi  _INIT(0);
+WLED_GLOBAL size_t selectedWiFi  _INIT(0);
 WLED_GLOBAL byte apChannel       _INIT(1);                        // 2.4GHz WiFi AP channel (1-13)
 WLED_GLOBAL byte apHide          _INIT(0);                        // hidden AP SSID
 WLED_GLOBAL byte apBehavior      _INIT(AP_BEHAVIOR_BOOT_NO_CONN); // access point opens when no connection after boot by default
diff --git a/wled00/xml.cpp b/wled00/xml.cpp
index 19868d01d9..2e0a840940 100644
--- a/wled00/xml.cpp
+++ b/wled00/xml.cpp
@@ -295,7 +295,7 @@ void getSettingsJS(byte subPage, Print& settingsScript)
     printSetFormCheckbox(settingsScript,PSTR("PR"),BusManager::hasParallelOutput());  // get it from bus manager not global variable
 
     unsigned sumMa = 0;
-    for (int s = 0; s < BusManager::getNumBusses(); s++) {
+    for (size_t s = 0; s < BusManager::getNumBusses(); s++) {
       const Bus* bus = BusManager::getBus(s);
       if (!bus || !bus->isOk()) break; // should not happen but for safety
       int offset = s < 10 ? '0' : 'A';