diff --git a/src/udpTracker.hpp b/src/udpTracker.hpp
index 18dd8cc..05e9798 100644
--- a/src/udpTracker.hpp
+++ b/src/udpTracker.hpp
@@ -28,6 +28,7 @@
 #include <sstream>
 #include <list>
 #include <ctime>
+#include <atomic>
 
 #include <thread>
 #include <boost/program_options.hpp>