diff --git a/hardware/raspberrypi/fan/files/fan_ctrl.py b/hardware/raspberrypi/fan/files/fan_ctrl.py
index 1ce9750..0ec3aaf 100644
--- a/hardware/raspberrypi/fan/files/fan_ctrl.py
+++ b/hardware/raspberrypi/fan/files/fan_ctrl.py
@@ -8,12 +8,12 @@ import time
 import sys
 
 # Configuration
-FAN_PIN = getenv(RPI_FAN_PIN, 21)  # BCM pin used to drive transistor's base
-WAIT_TIME = getenv(RPI_FAN_WAITTIME, 5)  # [s] Time to wait between each refresh
-FAN_MIN = getenv(RPI_FAN_MIN, 60)  # [%] Fan minimum speed.
-PWM_FREQ = getenv(RPI_FAN_PWMFREW, 50000)  # [Hz] Change this value if fan has strange behavior
+FAN_PIN = getenv("RPI_FAN_PIN", 21)  # BCM pin used to drive transistor's base
+WAIT_TIME = getenv("RPI_FAN_WAITTIME", 5)  # [s] Time to wait between each refresh
+FAN_MIN = getenv("RPI_FAN_MIN", 60)  # [%] Fan minimum speed.
+PWM_FREQ = getenv("RPI_FAN_PWMFREQ", 50000)  # [Hz] Change this value if fan has strange behavior
 # Fan speed will change only of the difference of temperature is higher than hysteresis
-hyst = getenv(RPI_FAN_HYST, 5)
+hyst = getenv("RPI_FAN_HYST", 5)
 
 # Configurable temperature and fan speed steps
 tempSteps = [50, 55, 57, 60, 68, 70]  # [°C]