diff --git a/presence/psensor.hpp b/presence/psensor.hpp
index 7afbd75..8ce2d7e 100644
--- a/presence/psensor.hpp
+++ b/presence/psensor.hpp
@@ -21,71 +21,72 @@
  */
 class PresenceSensor
 {
-    public:
-        PresenceSensor(const PresenceSensor&) = default;
-        PresenceSensor& operator=(const PresenceSensor&) = default;
-        PresenceSensor(PresenceSensor&&) = default;
-        PresenceSensor& operator=(PresenceSensor&&) = default;
-        virtual ~PresenceSensor() = default;
-        PresenceSensor() : id(nextId)
-        {
-            nextId++;
-        }
+  public:
+    PresenceSensor(const PresenceSensor&) = default;
+    PresenceSensor& operator=(const PresenceSensor&) = default;
+    PresenceSensor(PresenceSensor&&) = default;
+    PresenceSensor& operator=(PresenceSensor&&) = default;
+    virtual ~PresenceSensor() = default;
+    PresenceSensor() : id(nextId)
+    {
+        nextId++;
+    }
 
-        /**
-         * @brief start
-         *
-         * Implementations should peform any preparation
-         * for detecting presence.  Typical implementations
-         * might register signal callbacks or start
-         * a polling loop.
-         *
-         * @return The state of the sensor.
-         */
-        virtual bool start() = 0;
+    /**
+     * @brief start
+     *
+     * Implementations should peform any preparation
+     * for detecting presence.  Typical implementations
+     * might register signal callbacks or start
+     * a polling loop.
+     *
+     * @return The state of the sensor.
+     */
+    virtual bool start() = 0;
 
-        /**
-         * @brief stop
-         *
-         * Implementations should stop issuing presence
-         * state change notifications.  Typical implementations
-         * might de-register signal callbacks or terminate
-         * polling loops.
-         */
-        virtual void stop() = 0;
+    /**
+     * @brief stop
+     *
+     * Implementations should stop issuing presence
+     * state change notifications.  Typical implementations
+     * might de-register signal callbacks or terminate
+     * polling loops.
+     */
+    virtual void stop() = 0;
 
-        /**
-         * @brief Check the sensor.
-         *
-         * Implementations should perform an offline (the start
-         * method has not been invoked) query of the presence
-         * state.
-         *
-         * @return The state of the sensor.
-         */
-        virtual bool present() = 0;
+    /**
+     * @brief Check the sensor.
+     *
+     * Implementations should perform an offline (the start
+     * method has not been invoked) query of the presence
+     * state.
+     *
+     * @return The state of the sensor.
+     */
+    virtual bool present() = 0;
 
-        /**
-         * @brief Mark the sensor as failed.
-         *
-         * Implementations should log an an event if the
-         * system policy requires it.
-         *
-         * Provide a default noop implementation.
-         */
-        virtual void fail() {}
+    /**
+     * @brief Mark the sensor as failed.
+     *
+     * Implementations should log an an event if the
+     * system policy requires it.
+     *
+     * Provide a default noop implementation.
+     */
+    virtual void fail()
+    {}
 
-        friend bool operator==(const PresenceSensor& l, const PresenceSensor& r);
+    friend bool operator==(const PresenceSensor& l, const PresenceSensor& r);
 
-    private:
-        /** @brief Unique sensor ID. */
-        std::size_t id;
+  private:
+    /** @brief Unique sensor ID. */
+    std::size_t id;
 
-        /** @brief The next unique sensor ID. */
-        static std::size_t nextId;
+    /** @brief The next unique sensor ID. */
+    static std::size_t nextId;
 };
 
-inline bool operator==(const PresenceSensor& l, const PresenceSensor &r)
+inline bool operator==(const PresenceSensor& l, const PresenceSensor& r)
 {
     return l.id == r.id;
 }