diff --git a/presence/gpio.hpp b/presence/gpio.hpp
index 5f9e28b..ae4bc7f 100644
--- a/presence/gpio.hpp
+++ b/presence/gpio.hpp
@@ -79,6 +79,13 @@
      */
     bool present() override;
 
+    /**
+     * @brief Called when this presence sensor doesn't agree with other ones.
+     *
+     * @param[in] fanInventoryPath - The fan inventory D-Bus object path.
+     */
+    void logConflict(const std::string& fanInventoryPath) const override;
+
   private:
     /** @brief Get the policy associated with this sensor. */
     virtual RedundancyPolicy& getPolicy() = 0;