diff --git a/sht4x.c b/sht4x.c
index feacac7..5c71424 100644
--- a/sht4x.c
+++ b/sht4x.c
@@ -14,15 +14,15 @@
 
 /* TODO prejmenovat vsechny na sht4x_* */
 /* I2C */
-int8_t i2c_transmit(uint8_t address, uint8_t *buffer, int len) __attribute__((weak));
-int8_t i2c_receive(uint8_t address, uint8_t *buffer, int len) __attribute__((weak)); 
+int8_t sht4x_i2c_transmit(uint8_t address, uint8_t *buffer, int len) __attribute__((weak));
+int8_t sht4x_i2c_receive(uint8_t address, uint8_t *buffer, int len) __attribute__((weak)); 
 /* CRC */
 uint8_t sensirion_crc8_calculate(const uint8_t *data, uint16_t count) __attribute__((weak));
 /* Interrupts */
 int8_t sht4x_disable_interrupts(void) __attribute__((weak));
 int8_t sht4x_enable_interrupts(void) __attribute__((weak));
 /* delay function */
-void sht4x_delay_ms(int delay_ms) __attribute__((weak));
+void delay_ms(int delay_ms) __attribute__((weak));
 
 int8_t sht4x_send_cmd(sht4x_cmd_t cmd)
 {
@@ -43,15 +43,15 @@ int8_t sht4x_measure(int16_t *temperature, uint16_t *relative_humidity)
 	buffer[0] = SHT4X_START_MEAS_HIGH_PRECISION;
 	/* disable interrupts to prevent modbus/i2c conflict */
 	sht4x_disable_interrupts();
-	result = i2c_transmit(SHT4X_I2C_ADDRESS<<1, buffer, 1);
+	result = sht4x_i2c_transmit(SHT4X_I2C_ADDRESS<<1, buffer, 1);
 	sht4x_enable_interrupts();
 	if (result != 0) {
 		return SHT4X_ERROR;
 	}
-	sht4x_delay_ms(10); /* 10 ms should be enough */
+	delay_ms(10); /* 10 ms should be enough */
 	/* read out */
 	sht4x_disable_interrupts();
-	result = i2c_receive(SHT4X_I2C_ADDRESS<<1, buffer, 6);
+	result = sht4x_i2c_receive(SHT4X_I2C_ADDRESS<<1, buffer, 6);
 	sht4x_enable_interrupts();
 	if (result != 0) {
 		return SHT4X_ERROR;