diff --git a/include/ChassisIntrusionSensor.hpp b/include/ChassisIntrusionSensor.hpp
index 3f2b7c8..56affca 100644
--- a/include/ChassisIntrusionSensor.hpp
+++ b/include/ChassisIntrusionSensor.hpp
@@ -54,7 +54,7 @@
     bool mInitialized = false;
 
     void updateValue(const std::string& newValue);
-    int i2cReadFromPch(int busId, int slaveAddr);
+    static int i2cReadFromPch(int busId, int slaveAddr);
     void pollSensorStatusByPch();
     void readGpio();
     void pollSensorStatusByGpio();