diff --git a/src/message.h b/src/message.h
index 75f8098a860b4c5ed053ae169369da6123a9f619..476e0b24e01c5b562bdac18017456bb6b68f6975 100644
--- a/src/message.h
+++ b/src/message.h
@@ -5,6 +5,8 @@
 #ifndef PROJECT_MESSAGE_H
 #define PROJECT_MESSAGE_H
 
+#include <iostream>
+
 #define MSG_INFO(str)  {\
     std::cout << "INFO: " << str << std::endl;\
 }