diff --git a/src/MessagesQueue.hpp b/src/MessagesQueue.hpp
index bf7a6f6..fb5ef71 100644
--- a/src/MessagesQueue.hpp
+++ b/src/MessagesQueue.hpp
@@ -4,6 +4,7 @@
 #include <queue>
 #include <map>
 #include <mutex>
+#include <string>
 
 class MessagesQueue;
 
@@ -51,4 +52,4 @@ class MessagesQueue {
 
 
 
-#endif //HIGHLOADCUP_MESSAGESQUEUE_H
+#endif // HIGHLOADCUP_MESSAGESQUEUE_H