diff --git a/tasmota/support.ino b/tasmota/support.ino
index a791563ee..f2d2c75f5 100644
--- a/tasmota/support.ino
+++ b/tasmota/support.ino
@@ -391,7 +391,7 @@ char* NoAlNumToUnderscore(char* dest, const char* source)
   return dest;
 }
 
-char IndexSeparator()
+char IndexSeparator(void)
 {
 /*
   // 20 bytes more costly !?!
@@ -414,7 +414,7 @@ void SetShortcutDefault(void)
   }
 }
 
-uint8_t Shortcut()
+uint8_t Shortcut(void)
 {
   uint8_t result = 10;
 
@@ -921,7 +921,7 @@ int ResponseJsonEndEnd(void)
  * GPIO Module and Template management
 \*********************************************************************************************/
 
-uint8_t ModuleNr()
+uint8_t ModuleNr(void)
 {
   // 0    = User module (255)
   // 1 up = Template module 0 up
@@ -953,7 +953,7 @@ String AnyModuleName(uint32_t index)
   }
 }
 
-String ModuleName()
+String ModuleName(void)
 {
   return AnyModuleName(Settings.module);
 }
@@ -985,7 +985,7 @@ void ModuleGpios(myio *gp)
 //  AddLogBuffer(LOG_LEVEL_DEBUG, (uint8_t *)gp, sizeof(myio));
 }
 
-gpio_flag ModuleFlag()
+gpio_flag ModuleFlag(void)
 {
   gpio_flag flag;
 
@@ -1005,7 +1005,7 @@ void ModuleDefault(uint32_t module)
   memcpy_P(&Settings.user_template, &kModules[module], sizeof(mytmplt));
 }
 
-void SetModuleType()
+void SetModuleType(void)
 {
   my_module_type = (USER_MODULE == Settings.module) ? Settings.user_template_base : Settings.module;
 }
@@ -1033,7 +1033,7 @@ bool ValidGPIO(uint32_t pin, uint32_t gpio)
   return (GPIO_USER == ValidPin(pin, gpio));  // Only allow GPIO_USER pins
 }
 
-bool ValidAdc()
+bool ValidAdc(void)
 {
   gpio_flag flag = ModuleFlag();
   uint32_t template_adc0 = flag.data &15;
@@ -1133,7 +1133,7 @@ bool JsonTemplate(const char* dataBuf)
   return true;
 }
 
-void TemplateJson()
+void TemplateJson(void)
 {
   Response_P(PSTR("{\"" D_JSON_NAME "\":\"%s\",\"" D_JSON_GPIO "\":["), Settings.user_template.name);
   for (uint32_t i = 0; i < sizeof(Settings.user_template.gp); i++) {
diff --git a/tasmota/support_wifi.ino b/tasmota/support_wifi.ino
index f90d7cff1..c920c8a63 100644
--- a/tasmota/support_wifi.ino
+++ b/tasmota/support_wifi.ino
@@ -217,7 +217,7 @@ void WifiBegin(uint8_t flag, uint8_t channel)
 #endif  // LWIP_IPV6=1
 }
 
-void WifiBeginAfterScan()
+void WifiBeginAfterScan(void)
 {
   static int8_t best_network_db;
 
@@ -314,12 +314,12 @@ void WifiBeginAfterScan()
   }
 }
 
-uint16_t WifiLinkCount()
+uint16_t WifiLinkCount(void)
 {
   return Wifi.link_count;
 }
 
-String WifiDowntime()
+String WifiDowntime(void)
 {
   return GetDuration(Wifi.downtime);
 }
diff --git a/tasmota/tasmota.ino b/tasmota/tasmota.ino
index 1469caa2c..64a1125c6 100644
--- a/tasmota/tasmota.ino
+++ b/tasmota/tasmota.ino
@@ -1661,7 +1661,7 @@ void setup(void)
   XsnsCall(FUNC_INIT);
 }
 
-static void BacklogLoop()
+void BacklogLoop(void)
 {
   if (TimeReached(backlog_delay)) {
     if (!BACKLOG_EMPTY && !backlog_mutex) {
diff --git a/tasmota/xdrv_01_webserver.ino b/tasmota/xdrv_01_webserver.ino
index 64194c9c9..26d618326 100644
--- a/tasmota/xdrv_01_webserver.ino
+++ b/tasmota/xdrv_01_webserver.ino
@@ -730,7 +730,7 @@ void _WSContentSend(const String& content)        // Low level sendContent for a
   DEBUG_CORE_LOG(PSTR("WEB: Chunk size %d"), len);
 }
 
-void WSContentFlush()
+void WSContentFlush(void)
 {
   if (Web.chunk_buffer.length() > 0) {
     _WSContentSend(Web.chunk_buffer);                  // Flush chunk buffer
diff --git a/tasmota/xdrv_02_mqtt.ino b/tasmota/xdrv_02_mqtt.ino
index c8250afbb..bf4d82a49 100644
--- a/tasmota/xdrv_02_mqtt.ino
+++ b/tasmota/xdrv_02_mqtt.ino
@@ -468,7 +468,7 @@ void MqttPublishPowerState(uint32_t device)
 #endif  // USE_SONOFF_IFAN
 }
 
-void MqttPublishAllPowerState()
+void MqttPublishAllPowerState(void)
 {
   for (uint32_t i = 1; i <= devices_present; i++) {
     MqttPublishPowerState(i);
@@ -493,7 +493,7 @@ void MqttPublishPowerBlinkState(uint32_t device)
 
 /*********************************************************************************************/
 
-uint16_t MqttConnectCount()
+uint16_t MqttConnectCount(void)
 {
   return Mqtt.connect_count;
 }
diff --git a/tasmota/xdrv_03_energy.ino b/tasmota/xdrv_03_energy.ino
index 743fc82fc..6d8be5c2b 100644
--- a/tasmota/xdrv_03_energy.ino
+++ b/tasmota/xdrv_03_energy.ino
@@ -430,7 +430,7 @@ void EnergyMqttShow(void)
 }
 #endif  // USE_ENERGY_MARGIN_DETECTION
 
-void EnergyEverySecond()
+void EnergyEverySecond(void)
 {
   // Overtemp check
   if (global_update) {
diff --git a/tasmota/xdrv_05_irremote.ino b/tasmota/xdrv_05_irremote.ino
index 7ac3d0ca8..6b482f485 100644
--- a/tasmota/xdrv_05_irremote.ino
+++ b/tasmota/xdrv_05_irremote.ino
@@ -66,7 +66,7 @@ IRrecv *irrecv = nullptr;
 
 unsigned long ir_lasttime = 0;
 
-void IrReceiveUpdateThreshold()
+void IrReceiveUpdateThreshold(void)
 {
   if (irrecv != nullptr) {
     if (Settings.param[P_IR_UNKNOW_THRESHOLD] < 6) { Settings.param[P_IR_UNKNOW_THRESHOLD] = 6; }
diff --git a/tasmota/xdrv_05_irremote_full.ino b/tasmota/xdrv_05_irremote_full.ino
index 5cb6d1d00..7625d057a 100644
--- a/tasmota/xdrv_05_irremote_full.ino
+++ b/tasmota/xdrv_05_irremote_full.ino
@@ -92,7 +92,7 @@ IRrecv *irrecv = nullptr;
 
 unsigned long ir_lasttime = 0;
 
-void IrReceiveUpdateThreshold()
+void IrReceiveUpdateThreshold(void)
 {
   if (irrecv != nullptr) {
     if (Settings.param[P_IR_UNKNOW_THRESHOLD] < 6) { Settings.param[P_IR_UNKNOW_THRESHOLD] = 6; }
diff --git a/tasmota/xdrv_07_domoticz.ino b/tasmota/xdrv_07_domoticz.ino
index 64f222e6e..f5e8af19c 100644
--- a/tasmota/xdrv_07_domoticz.ino
+++ b/tasmota/xdrv_07_domoticz.ino
@@ -80,7 +80,7 @@ int DomoticzRssiQuality(void)
 }
 
 #ifdef USE_SONOFF_IFAN
-void MqttPublishDomoticzFanState()
+void MqttPublishDomoticzFanState(void)
 {
   if (Settings.flag.mqtt_enabled && Settings.domoticz_relay_idx[1]) {  // SetOption3 - Enable MQTT
     char svalue[8];  // Fanspeed value
@@ -94,7 +94,7 @@ void MqttPublishDomoticzFanState()
   }
 }
 
-void DomoticzUpdateFanState()
+void DomoticzUpdateFanState(void)
 {
   if (domoticz_update_flag) {
     MqttPublishDomoticzFanState();
diff --git a/tasmota/xdrv_10_rules.ino b/tasmota/xdrv_10_rules.ino
index 64ae42f1c..4025ef5d4 100644
--- a/tasmota/xdrv_10_rules.ino
+++ b/tasmota/xdrv_10_rules.ino
@@ -1226,7 +1226,7 @@ float evaluateExpression(const char * expression, unsigned int len)
 #endif  // USE_EXPRESSION
 
 #ifdef  SUPPORT_IF_STATEMENT
-void CmndIf()
+void CmndIf(void)
 {
   if (XdrvMailbox.data_len > 0) {
     char parameters[XdrvMailbox.data_len+1];
diff --git a/tasmota/xdrv_22_sonoff_ifan.ino b/tasmota/xdrv_22_sonoff_ifan.ino
index 2c1031e23..4fd2bd2b6 100644
--- a/tasmota/xdrv_22_sonoff_ifan.ino
+++ b/tasmota/xdrv_22_sonoff_ifan.ino
@@ -43,7 +43,7 @@ bool ifan_restart_flag = true;
 
 /*********************************************************************************************/
 
-bool IsModuleIfan()
+bool IsModuleIfan(void)
 {
   return ((SONOFF_IFAN02 == my_module_type) || (SONOFF_IFAN03 == my_module_type));
 }
diff --git a/tasmota/xdrv_28_pcf8574.ino b/tasmota/xdrv_28_pcf8574.ino
index 9448f6e6d..212217a49 100644
--- a/tasmota/xdrv_28_pcf8574.ino
+++ b/tasmota/xdrv_28_pcf8574.ino
@@ -72,7 +72,7 @@ void Pcf8574SwitchRelay(void)
   }
 }
 
-void Pcf8574Init()
+void Pcf8574Init(void)
 {
   uint8_t pcf8574_address = PCF8574_ADDR1;
   while ((Pcf8574.max_devices < MAX_PCF8574) && (pcf8574_address < PCF8574_ADDR2 +8)) {
@@ -178,7 +178,7 @@ void HandlePcf8574(void)
   WSContentStop();
 }
 
-void Pcf8574SaveSettings()
+void Pcf8574SaveSettings(void)
 {
   char stemp[7];
   char tmp[100];
diff --git a/tasmota/xdsp_02_ssd1306.ino b/tasmota/xdsp_02_ssd1306.ino
index 0b1fff3d0..e263901bc 100644
--- a/tasmota/xdsp_02_ssd1306.ino
+++ b/tasmota/xdsp_02_ssd1306.ino
@@ -47,7 +47,7 @@ extern uint8_t *buffer;
 
 /*********************************************************************************************/
 
-void SSD1306InitDriver()
+void SSD1306InitDriver(void)
 {
   if (!Settings.display_model) {
     if (I2cSetDevice(OLED_ADDRESS1)) {
diff --git a/tasmota/xnrg_07_ade7953.ino b/tasmota/xnrg_07_ade7953.ino
index 60174d0b6..8643af065 100644
--- a/tasmota/xnrg_07_ade7953.ino
+++ b/tasmota/xnrg_07_ade7953.ino
@@ -185,7 +185,7 @@ void Ade7953GetData(void)
   }
 }
 
-void Ade7953EnergyEverySecond()
+void Ade7953EnergyEverySecond(void)
 {
 	if (Ade7953.init_step) {
     if (1 == Ade7953.init_step) {
diff --git a/tasmota/xnrg_12_solaxX1.ino b/tasmota/xnrg_12_solaxX1.ino
index b520302d3..910ca5822 100644
--- a/tasmota/xnrg_12_solaxX1.ino
+++ b/tasmota/xnrg_12_solaxX1.ino
@@ -201,7 +201,7 @@ uint16_t solaxX1_calculateCRC(uint8_t *bExternTxPackage, uint8_t bLen)
   return wChkSum;
 }
 
-void solaxX1_SendInverterAddress()
+void solaxX1_SendInverterAddress(void)
 {
   source[0] = 0x00;
   destination[0] = 0x00;
@@ -213,7 +213,7 @@ void solaxX1_SendInverterAddress()
   solaxX1_RS485Send(24);
 }
 
-void solaxX1_QueryLiveData()
+void solaxX1_QueryLiveData(void)
 {
   source[0] = 0x01;
   destination[0] = 0x00;
diff --git a/tasmota/xsns_02_analog.ino b/tasmota/xsns_02_analog.ino
index b65c23ab5..ddefb6729 100644
--- a/tasmota/xsns_02_analog.ino
+++ b/tasmota/xsns_02_analog.ino
@@ -101,7 +101,7 @@ void AdcEvery250ms(void)
 }
 #endif  // USE_RULES
 
-uint16_t AdcGetLux()
+uint16_t AdcGetLux(void)
 {
   int adc = AdcRead(2);
   // Source: https://www.allaboutcircuits.com/projects/design-a-luxmeter-using-a-light-dependent-resistor/
diff --git a/tasmota/xsns_34_hx711.ino b/tasmota/xsns_34_hx711.ino
index 6065ad719..d9076f61d 100644
--- a/tasmota/xsns_34_hx711.ino
+++ b/tasmota/xsns_34_hx711.ino
@@ -90,7 +90,7 @@ bool HxIsReady(uint16_t timeout)
   return (digitalRead(Hx.pin_dout) == LOW);
 }
 
-long HxRead()
+long HxRead(void)
 {
   if (!HxIsReady(HX_TIMEOUT)) { return -1; }
 
@@ -241,7 +241,7 @@ bool HxCommand(void)
 
 /*********************************************************************************************/
 
-long HxWeight()
+long HxWeight(void)
 {
   return (Hx.calibrate_step < HX_CAL_FAIL) ? Hx.weight : 0;
 }
@@ -371,7 +371,7 @@ void HxEvery100mSecond(void)
   }
 }
 
-void HxSaveBeforeRestart()
+void HxSaveBeforeRestart(void)
 {
   Settings.energy_frequency_calibration = Hx.weight;
   Hx.sample_count = HX_SAMPLES +1;                   // Stop updating Hx.weight