diff --git a/include/ExternalSensor.hpp b/include/ExternalSensor.hpp
index a8b48e5..3ca3c8a 100644
--- a/include/ExternalSensor.hpp
+++ b/include/ExternalSensor.hpp
@@ -23,7 +23,7 @@
                    const std::string& sensorConfiguration, double maxReading,
                    double minReading, double timeoutSecs,
                    const PowerState& powerState);
-    virtual ~ExternalSensor();
+    ~ExternalSensor() override;
 
     // Call this immediately after calling the constructor
     void initWriteHook(