diff --git a/core/Event_Handler.hh b/core/Event_Handler.hh
index 7aa09df40139bbdcc7919fe29e911283ba55dc7a..2e884b6f15b49a7048209f31736df1ff0a127144 100644
--- a/core/Event_Handler.hh
+++ b/core/Event_Handler.hh
@@ -9,6 +9,7 @@
 #define EVENT_HANDLER_HH
 
 #include "Types.h"
+#include <sys/select.h>
 
 /**
 * The definitions in this header file are needed for TITAN.