diff --git a/left/src/bridge_protocol_handler.c b/left/src/bridge_protocol_handler.c
index 760f7ca..1a906e3 100644
--- a/left/src/bridge_protocol_handler.c
+++ b/left/src/bridge_protocol_handler.c
@@ -9,14 +9,14 @@
 #include "init_peripherials.h"
 
 void SetError(uint8_t error);
-void SetGenericError();
+void SetGenericError(void);
 void SetResponseByte(uint8_t response);
 
 void SetError(uint8_t error) {
     BridgeTxBuffer[0] = error;
 }
 
-void SetGenericError()
+void SetGenericError(void)
 {
     SetError(PROTOCOL_RESPONSE_GENERIC_ERROR);
 }
@@ -27,7 +27,7 @@ void SetResponseByte(uint8_t response)
     BridgeTxBuffer[1] = response;
 }
 
-void BridgeProtocolHandler()
+void BridgeProtocolHandler(void)
 {
     uint8_t commandId = BridgeRxBuffer[0];
     switch (commandId) {
diff --git a/left/src/bridge_protocol_handler.h b/left/src/bridge_protocol_handler.h
index b1d7ff6..a36bee2 100644
--- a/left/src/bridge_protocol_handler.h
+++ b/left/src/bridge_protocol_handler.h
@@ -21,6 +21,6 @@
 
 // Functions:
 
-    extern void BridgeProtocolHandler();
+    extern void BridgeProtocolHandler(void);
 
 #endif
diff --git a/left/src/init_clock.h b/left/src/init_clock.h
index 1b0681f..7e01f88 100644
--- a/left/src/init_clock.h
+++ b/left/src/init_clock.h
@@ -3,6 +3,6 @@
 
 // Functions:
 
-    void InitClock();
+    void InitClock(void);
 
 #endif
diff --git a/left/src/init_peripherials.c b/left/src/init_peripherials.c
index ac48953..888fa33 100644
--- a/left/src/init_peripherials.c
+++ b/left/src/init_peripherials.c
@@ -34,7 +34,7 @@ static void i2cSlaveCallback(I2C_Type *base, i2c_slave_transfer_t *xfer, void *u
     }
 }
 
-void InitI2c() {
+void InitI2c(void) {
     port_pin_config_t pinConfig = {
         .pullSelect = kPORT_PullUp,
     };
@@ -57,7 +57,7 @@ void InitI2c() {
     I2C_SlaveTransferNonBlocking(I2C_BUS_BASEADDR, &slaveHandle, kI2C_SlaveCompletionEvent);
 }
 
-void InitLedDriver() {
+void InitLedDriver(void) {
     CLOCK_EnableClock(LED_DRIVER_SDB_CLOCK);
     PORT_SetPinMux(LED_DRIVER_SDB_PORT, LED_DRIVER_SDB_PIN, kPORT_MuxAsGpio);
     GPIO_PinInit(LED_DRIVER_SDB_GPIO, LED_DRIVER_SDB_PIN, &(gpio_pin_config_t){kGPIO_DigitalOutput, 0});
diff --git a/left/src/init_peripherials.h b/left/src/init_peripherials.h
index 0f75387..4b9d38c 100644
--- a/left/src/init_peripherials.h
+++ b/left/src/init_peripherials.h
@@ -10,6 +10,6 @@
 
 // Functions:
 
-    void InitPeripherials();
+    void InitPeripherials(void);
 
 #endif
diff --git a/left/src/led_pwm.c b/left/src/led_pwm.c
index fa6cdee..9cf3d37 100644
--- a/left/src/led_pwm.c
+++ b/left/src/led_pwm.c
@@ -1,7 +1,7 @@
 #include "led_pwm.h"
 #include "fsl_port.h"
 
-void LedPwm_Init() {
+void LedPwm_Init(void) {
     CLOCK_EnableClock(LED_PWM_CLOCK);
     PORT_SetPinMux(LED_PWM_PORT, LED_PWM_PIN, kPORT_MuxAlt2);
 
diff --git a/left/src/led_pwm.h b/left/src/led_pwm.h
index 456b5b2..f916495 100644
--- a/left/src/led_pwm.h
+++ b/left/src/led_pwm.h
@@ -21,7 +21,7 @@
 
 // Functions:
 
-    extern void LedPwm_Init();
+    extern void LedPwm_Init(void);
     void LedPwm_SetBrightness(uint8_t brightnessPercent);
 
 #endif
diff --git a/left/src/test_led.c b/left/src/test_led.c
index 449735a..acb24cd 100644
--- a/left/src/test_led.c
+++ b/left/src/test_led.c
@@ -1,7 +1,7 @@
 #include "test_led.h"
 #include "fsl_port.h"
 
-extern void InitTestLed()
+extern void InitTestLed(void)
 {
     CLOCK_EnableClock(TEST_LED_CLOCK);
     PORT_SetPinMux(TEST_LED_PORT, TEST_LED_PIN, kPORT_MuxAsGpio);
diff --git a/left/src/test_led.h b/left/src/test_led.h
index 2afb597..72b010a 100644
--- a/left/src/test_led.h
+++ b/left/src/test_led.h
@@ -22,6 +22,6 @@
 
 // Functions:
 
-    extern void InitTestLed();
+    extern void InitTestLed(void);
 
 #endif