diff --git a/server/rankserver/guildmgr.cc b/server/rankserver/guildmgr.cc
index b93ae60..91ed9ef 100644
--- a/server/rankserver/guildmgr.cc
+++ b/server/rankserver/guildmgr.cc
@@ -1,5 +1,7 @@
 #include "precompile.h"
 
+#include <random>
+
 #include <a8/udplog.h>
 #include <a8/timer.h>
 #include <a8/openssl.h>