diff --git a/main/heartbeat/heartbeat.h b/main/heartbeat/heartbeat.h
index e0af53b..8582c18 100644
--- a/main/heartbeat/heartbeat.h
+++ b/main/heartbeat/heartbeat.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "esp_err.h"
+#include <stdbool.h>
 
 /**
  * Initialize the heartbeat service (logs ready state).