diff --git a/src/slic3r/GUI/DeviceCore/DevExtruderSystem.h b/src/slic3r/GUI/DeviceCore/DevExtruderSystem.h
index 1f7ca6bd84..d0f7c105da 100644
--- a/src/slic3r/GUI/DeviceCore/DevExtruderSystem.h
+++ b/src/slic3r/GUI/DeviceCore/DevExtruderSystem.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <optional>
 #include "libslic3r/CommonDefs.hpp"
 
 #include "slic3r/Utils/json_diff.hpp"