diff --git a/src/net/sessiondata.h b/src/net/sessiondata.h
index 71041166..d4f8f45e 100644
--- a/src/net/sessiondata.h
+++ b/src/net/sessiondata.h
@@ -40,6 +40,7 @@ typedef unsigned SessionId;
 #include <boost/thread.hpp>
 #include <boost/enable_shared_from_this.hpp>
 #include <string>
+#include <array>
 
 #include <net/socket_helper.h>
 #include <net/sessiondatacallback.h>