diff --git a/src/slic3r/GUI/ImGuiWrapper.hpp b/src/slic3r/GUI/ImGuiWrapper.hpp
index 201fe47e2..c2382e5c8 100644
--- a/src/slic3r/GUI/ImGuiWrapper.hpp
+++ b/src/slic3r/GUI/ImGuiWrapper.hpp
@@ -7,6 +7,7 @@
 #include <imgui/imgui.h>
 
 #include "libslic3r/Point.hpp"
+#include "libslic3r/Polygon.hpp"
 
 namespace Slic3r {namespace Search {
 struct OptionViewParameters;