diff --git a/src/LeanTask.h b/src/LeanTask.h
index 06be682..134e520 100644
--- a/src/LeanTask.h
+++ b/src/LeanTask.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <Arduino.h>
+#include "AbstractTask.h"
 
 class LeanTask : public AbstractTask {
  public: