diff --git a/ethread/tools.h b/ethread/tools.h
index 45f8143..702cbc7 100644
--- a/ethread/tools.h
+++ b/ethread/tools.h
@@ -8,6 +8,7 @@
 #pragma once
 
 #include <thread>
+#include <string>
 
 /**
  * @brief ethread main namespace