diff --git a/radio/src/targets/sky9x/board.h b/radio/src/targets/sky9x/board.h
index 5d0d88dde..4ff927aa4 100644
--- a/radio/src/targets/sky9x/board.h
+++ b/radio/src/targets/sky9x/board.h
@@ -161,11 +161,11 @@ enum EnumSwitches
 #define LCD_CONTRAST_MIN               10
 #define LCD_CONTRAST_MAX               45
 #define LCD_CONTRAST_DEFAULT           25
-void lcdInit(void);
-void lcdRefresh(void);
+void lcdInit();
+void lcdRefresh();
 #define lcdRefreshWait()
 void lcdSetRefVolt(uint8_t val);
-void lcdSetContrast(void);
+void lcdSetContrast();
 
 // USB driver
 void usbMassStorage();
@@ -218,8 +218,8 @@ void flashWrite(uint32_t * address, uint32_t * buffer);
 
 // Keys driver
 uint32_t switchState(uint8_t index);
-uint32_t readKeys(void);
-uint32_t readTrims(void);
+uint32_t readKeys();
+uint32_t readTrims();
 #define NUM_TRIMS                      4
 #define NUM_TRIMS_KEYS                 (NUM_TRIMS * 2)
 #define TRIMS_PRESSED()                readTrims()
@@ -342,7 +342,7 @@ extern int8_t Coproc_maxtemp;
 
 // Haptic driver
 #define HAPTIC_PWM
-void hapticOff(void);
+void hapticOff();
 void hapticOn(uint32_t pwmPercent);
 
 // BlueTooth driver
@@ -357,8 +357,9 @@ void btPushByte(uint8_t data);
 #define SOFT_PWR_CTRL
 void pwrInit();
 void pwrOff();
+void pwrOn();
 uint32_t pwrCheck();
-uint32_t pwrPressed();
+bool pwrPressed();
 #define UNEXPECTED_SHUTDOWN()          (g_eeGeneral.unexpectedShutdown)
 
 // EEPROM driver
@@ -366,7 +367,7 @@ uint32_t pwrPressed();
 #define EEPROM_BLOCK_SIZE     (4*1024)
 void eepromInit();
 uint8_t eepromReadStatus();
-uint8_t eepromIsTransferComplete(void);
+uint8_t eepromIsTransferComplete();
 void eepromBlockErase(uint32_t address);
 void eepromStartRead(uint8_t * buffer, size_t address, size_t size);
 void eepromStartWrite(uint8_t * buffer, size_t address, size_t size);
diff --git a/radio/src/targets/sky9x/pwr_driver.cpp b/radio/src/targets/sky9x/pwr_driver.cpp
index 7ade8a844..a62b558c1 100644
--- a/radio/src/targets/sky9x/pwr_driver.cpp
+++ b/radio/src/targets/sky9x/pwr_driver.cpp
@@ -20,7 +20,14 @@
 
 #include "opentx.h"
 
-uint32_t pwrPressed()
+void pwrInit()
+{
+  // Configure RF_power (PC17)
+  configure_pins(PIO_PC17, PIN_ENABLE | PIN_INPUT | PIN_PORTC | PIN_NO_PULLUP | PIN_PULLDOWN);
+  configure_pins(PIO_PA8, PIN_ENABLE | PIN_INPUT | PIN_PORTA | PIN_PULLUP); // Enable bit A8 (Soft Power)
+}
+
+bool pwrPressed()
 {
 #if defined(SIMU)
   return true;
@@ -29,15 +36,12 @@ uint32_t pwrPressed()
 #endif
 }
 
+void pwrOn()
+{
+}
+
 // turn off soft power
 void pwrOff()
 {
   configure_pins(PIO_PA8, PIN_ENABLE | PIN_OUTPUT | PIN_LOW | PIN_PORTA | PIN_NO_PULLUP);
 }
-
-void pwrInit()
-{
-  // Configure RF_power (PC17)
-  configure_pins(PIO_PC17, PIN_ENABLE | PIN_INPUT | PIN_PORTC | PIN_NO_PULLUP | PIN_PULLDOWN);
-  configure_pins(PIO_PA8, PIN_ENABLE | PIN_INPUT | PIN_PORTA | PIN_PULLUP); // Enable bit A8 (Soft Power)
-}