diff --git a/include/ctrack.hpp b/include/ctrack.hpp
index 05fbca9..4641378 100644
--- a/include/ctrack.hpp
+++ b/include/ctrack.hpp
@@ -7,6 +7,7 @@
 
 #include <string>
 #include <iostream>
+#include <iterator>
 #include <thread>
 #include <chrono>
 #include <mutex>