diff --git a/zh_avr_i2c.c b/zh_avr_i2c.c
index 3b0974c..9ac8e45 100644
--- a/zh_avr_i2c.c
+++ b/zh_avr_i2c.c
@@ -49,11 +49,11 @@ avr_err_t zh_avr_i2c_master_probe(const uint8_t addr, TickType_t xTicksToWait)
 	_target_i2c_address = addr;
 	TWCR = I2C_START | (1 << TWSTA);
 	EventBits_t bits = xEventGroupWaitBits(_event_group_handle, I2C_OK | I2C_NACK | I2C_COLLISION | I2C_BUS_FAIL, pdTRUE, pdFALSE, xTicksToWait);
-	if (bits & I2C_OK)
+	if ((bits & I2C_OK) != 0)
 	{
 		return AVR_OK;
 	}
-	else if (bits & I2C_NACK)
+	else if ((bits & I2C_NACK) != 0)
 	{
 		return AVR_ERR_INVALID_RESPONSE;
 	}