diff --git a/src/usr/user_session_handler.cpp b/src/usr/user_session_handler.cpp
index b4e7c2ec..47411ec7 100644
--- a/src/usr/user_session_handler.cpp
+++ b/src/usr/user_session_handler.cpp
@@ -7,6 +7,7 @@
 #include "../sock/socket_session.hpp"
 #include "../proc.hpp"
 #include "../hplog.hpp"
+#include "../jsonschema/usrmsg_helpers.hpp"
 #include "usr.hpp"
 #include "user_session_handler.hpp"