diff --git a/code/src/main.py b/code/src/main.py
index a72affc..10107d3 100644
--- a/code/src/main.py
+++ b/code/src/main.py
@@ -6,6 +6,7 @@ from micropyserver import MicroPyServer
 from micropyserver_utils import send_response, get_request_post_params
 import ntptime
 import os
+import io
 
 DHT_PIN = 26
 RELAY_PIN = 4
@@ -13,11 +14,11 @@ UPDATE_INTERVAL_S = 60
 MAX_LOG_SIZE = 3 * 1024 * 1024 # MegaByte
 
 name = "Test Sensor"
+
 humidity_limit_path = 'humidity_limit'
 sensor_log_path = 'sensors.log'
-sensor_log_path = 'sensors.log'
-log_file = None 
-log_cursor_file = None
+log_file: io.TextIOWrapper
+log_cursor_file: io.TextIOWrapper
 
 server = MicroPyServer()
 dht = dht.DHT22(Pin(DHT_PIN))