diff --git a/variants/elbear_ace_uno/pins_arduino.h b/variants/elbear_ace_uno/pins_arduino.h
index e171610..086a83f 100644
--- a/variants/elbear_ace_uno/pins_arduino.h
+++ b/variants/elbear_ace_uno/pins_arduino.h
@@ -67,6 +67,7 @@ volatile uint32_t* portOutputRegister(GPIO_TypeDef* GPIO_x);
 volatile uint32_t* portInputRegister(GPIO_TypeDef* GPIO_x);
 // the function initializes additional MCU pins depending on the specified pin number
 void additionalPinsInit(uint32_t PinNumber);
+static inline void additionalPinsDeinit(uint32_t PinNumber){}
 
 // UART
 // available uarts quantity
diff --git a/variants/elsomik/pins_arduino.h b/variants/elsomik/pins_arduino.h
index 58c4dff..d42da8d 100644
--- a/variants/elsomik/pins_arduino.h
+++ b/variants/elsomik/pins_arduino.h
@@ -118,8 +118,9 @@ static inline uint16_t pinCommonQty(void)
 volatile uint32_t* portOutputRegister(GPIO_TypeDef* GPIO_x);
 // the function returns a reference to the STATE address of the GPIO register
 volatile uint32_t* portInputRegister(GPIO_TypeDef* GPIO_x);
-// the function is needed for compatibility with other boards
+// functions are needed for compatibility with other boards
 static inline void additionalPinsInit(uint32_t PinNumber) {}
+static inline void additionalPinsDeinit(uint32_t PinNumber){}
 
 // UART
 // available uarts quantity
diff --git a/variants/start/pins_arduino.h b/variants/start/pins_arduino.h
index 58c4dff..d42da8d 100644
--- a/variants/start/pins_arduino.h
+++ b/variants/start/pins_arduino.h
@@ -118,8 +118,9 @@ static inline uint16_t pinCommonQty(void)
 volatile uint32_t* portOutputRegister(GPIO_TypeDef* GPIO_x);
 // the function returns a reference to the STATE address of the GPIO register
 volatile uint32_t* portInputRegister(GPIO_TypeDef* GPIO_x);
-// the function is needed for compatibility with other boards
+// functions are needed for compatibility with other boards
 static inline void additionalPinsInit(uint32_t PinNumber) {}
+static inline void additionalPinsDeinit(uint32_t PinNumber){}
 
 // UART
 // available uarts quantity