diff --git a/src/ripple/app/misc/impl/ValidatorList.cpp b/src/ripple/app/misc/impl/ValidatorList.cpp
index e5d9463adb9..ebb34a7e523 100644
--- a/src/ripple/app/misc/impl/ValidatorList.cpp
+++ b/src/ripple/app/misc/impl/ValidatorList.cpp
@@ -25,6 +25,7 @@
 #include <ripple/basics/base64.h>
 #include <ripple/json/json_reader.h>
 #include <ripple/overlay/Overlay.h>
+#include <ripple/protocol/STValidation.h>
 #include <ripple/protocol/jss.h>
 #include <ripple/protocol/messages.h>
 #include <boost/regex.hpp>