diff --git a/src/Mod/Part/App/OpenCascadeAll.h b/src/Mod/Part/App/OpenCascadeAll.h
index c4967fb54f..e847c7d7b3 100644
--- a/src/Mod/Part/App/OpenCascadeAll.h
+++ b/src/Mod/Part/App/OpenCascadeAll.h
@@ -280,6 +280,7 @@
 #include <BRepCheck_Result.hxx>
 #include <BRepCheck_ListIteratorOfListOfStatus.hxx>
 #include <BRepProj_Projection.hxx>
+#include <Poly_Connect.hxx>
 #include <Poly_Triangulation.hxx>
 #include <Poly_PolygonOnTriangulation.hxx>
 #include <Poly_Polygon3D.hxx>
@@ -315,6 +316,8 @@
 #include <gce_MakeParab.hxx>
 #include <gce_MakeParab2d.hxx>
 
+#include <CSLib.hxx>
+
 #include <Geom2d_BezierCurve.hxx>
 #include <Geom2d_BSplineCurve.hxx>
 #include <Geom2d_Curve.hxx>
diff --git a/src/Mod/Part/App/PreCompiled.h b/src/Mod/Part/App/PreCompiled.h
index 636b5ea3cb..bb9b1cb04f 100644
--- a/src/Mod/Part/App/PreCompiled.h
+++ b/src/Mod/Part/App/PreCompiled.h
@@ -94,7 +94,6 @@
 #include "OpenCascadeAll.h"
 #include <math_Gauss.hxx>
 #include <math_Matrix.hxx>
-#include <Poly_Connect.hxx>
 
 #elif defined(FC_OS_WIN32)
 #define WIN32_LEAN_AND_MEAN