diff --git a/src/on_change_threshold.hpp b/src/on_change_threshold.hpp
index 80876a2..1d4a4d0 100644
--- a/src/on_change_threshold.hpp
+++ b/src/on_change_threshold.hpp
@@ -33,6 +33,7 @@
     Sensors sensors;
     const std::vector<std::unique_ptr<interfaces::TriggerAction>> actions;
     bool initialized = false;
+    bool isFirstReading = true;
 
     void commit(const std::string&, Milliseconds, double);
 };