diff --git a/src/config.hpp b/src/config.hpp
index 8f3313d9..1743c0cc 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -16,6 +16,7 @@
 
 #pragma once
 
+#include "tofrom_ref.hpp"
 #include "branches.hpp"
 #include "category.hpp"
 #include "config_cachefiles.hpp"