diff --git a/src/ripple/app/hook/impl/applyHook.cpp b/src/ripple/app/hook/impl/applyHook.cpp
index e0669d874..162e0a15e 100644
--- a/src/ripple/app/hook/impl/applyHook.cpp
+++ b/src/ripple/app/hook/impl/applyHook.cpp
@@ -29,6 +29,7 @@
 #include <tuple>
 #include <ripple/json/json_value.h>
 #include <ripple/json/json_writer.h>
+#include <ripple/json/json_reader.h>
 
 using namespace ripple;
 // check if any std::optionals are missing (any !has_value())