diff --git a/source/blender/freestyle/intern/geometry/matrix_util.cpp b/source/blender/freestyle/intern/geometry/matrix_util.cpp
index fca92d4ed77..47a94ec7fff 100644
--- a/source/blender/freestyle/intern/geometry/matrix_util.cpp
+++ b/source/blender/freestyle/intern/geometry/matrix_util.cpp
@@ -13,6 +13,7 @@
 #include "matrix_util.h"
 
 #include "BLI_math_base.h"
+#include "BLI_utildefines.h"
 
 namespace Freestyle::OGF::MatrixUtil {
 
diff --git a/source/blender/freestyle/intern/winged_edge/Nature.h b/source/blender/freestyle/intern/winged_edge/Nature.h
index bd11cbb275e..bc47f692361 100644
--- a/source/blender/freestyle/intern/winged_edge/Nature.h
+++ b/source/blender/freestyle/intern/winged_edge/Nature.h
@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include "BLI_sys_types.h"
+
 /** \file
  * \ingroup freestyle
  * \brief Different natures for both vertices and edges