diff --git a/AdaptiveBrightness/sensor_driver.hpp b/AdaptiveBrightness/sensor_driver.hpp
index 87d5e88..7eda2b5 100644
--- a/AdaptiveBrightness/sensor_driver.hpp
+++ b/AdaptiveBrightness/sensor_driver.hpp
@@ -24,7 +24,7 @@ class SensorDriver {
         static constexpr auto RANGE_CMD = std::string_view{"range"};
         static constexpr auto READ_CMD = std::string_view{"read csv"};
 
-        QString m_serialPortName;
+        const QString m_serialPortName;
 
         bool isValidSensor() const;