diff --git a/src/overlay.hpp b/src/overlay.hpp
index fb5be7b1d703..31d73000c4a5 100644
--- a/src/overlay.hpp
+++ b/src/overlay.hpp
@@ -14,6 +14,7 @@
 
 #pragma once
 
+#include "config.hpp"
 #include "halo.hpp"
 
 struct overlay