diff --git a/presence/fallback.hpp b/presence/fallback.hpp
index bd9d1a5..d6bad02 100644
--- a/presence/fallback.hpp
+++ b/presence/fallback.hpp
@@ -58,7 +58,7 @@
      *             to the active sensor.
      * @param[in] sensor - The sensor that changed state.
      */
-    void stateChanged(bool present, PresenceSensor& sensor) override;
+    void stateChanged(bool present, PresenceSensor& /*sensor*/) override;
 
     /**
      * @brief monitor