diff --git a/src/libslic3r/Interlocking/InterlockingGenerator.cpp b/src/libslic3r/Interlocking/InterlockingGenerator.cpp
index 5a9fc21d6..a52c92dc0 100644
--- a/src/libslic3r/Interlocking/InterlockingGenerator.cpp
+++ b/src/libslic3r/Interlocking/InterlockingGenerator.cpp
@@ -1,6 +1,7 @@
 // Copyright (c) 2023 UltiMaker
 // CuraEngine is released under the terms of the AGPLv3 or higher.
 
+#include "ClipperUtils.hpp"
 #include "InterlockingGenerator.hpp"
 #include "Layer.hpp"