diff --git a/YSFGateway/Hosts.cpp b/YSFGateway/Hosts.cpp
index ac267ff..a55faed 100644
--- a/YSFGateway/Hosts.cpp
+++ b/YSFGateway/Hosts.cpp
@@ -20,6 +20,7 @@
 #include "Log.h"
 
 #include <cstdio>
+#include <cstdlib>
 #include <cstring>
 #include <cctype>