diff --git a/Polyhedron/demo/Polyhedron/Plugins/PMP/Join_and_split_polyhedra_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/PMP/Join_and_split_polyhedra_plugin.cpp
index eda3143f849..0f8b641663b 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/PMP/Join_and_split_polyhedra_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/PMP/Join_and_split_polyhedra_plugin.cpp
@@ -13,6 +13,7 @@
 
 #include <CGAL/Polyhedron_copy_3.h>
 #include <CGAL/Polygon_mesh_processing/connected_components.h>
+#include <CGAL/internal/corefinement/connected_components.h>
 
 #include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>
 #include <CGAL/property_map.h>
diff --git a/Polyhedron/demo/Polyhedron/Plugins/PMP/Mean_curvature_flow_skeleton_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/PMP/Mean_curvature_flow_skeleton_plugin.cpp
index e5fdbdb59f1..21526139b7c 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/PMP/Mean_curvature_flow_skeleton_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/PMP/Mean_curvature_flow_skeleton_plugin.cpp
@@ -25,7 +25,8 @@
 #include <CGAL/extract_mean_curvature_flow_skeleton.h>
 #include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>
 #include <CGAL/iterator.h>
-#include <CGAL/Polygon_mesh_processing/connected_components.h>
+#include <CGAL/internal/corefinement/connected_components.h>
+
 #include <CGAL/boost/graph/split_graph_into_polylines.h>
 #include <CGAL/mesh_segmentation.h>
 #include <CGAL/Polyhedron_copy_3.h>
diff --git a/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/MCF_Skeleton_test.cpp b/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/MCF_Skeleton_test.cpp
index ae8a9926bee..4467550ae86 100644
--- a/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/MCF_Skeleton_test.cpp
+++ b/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/MCF_Skeleton_test.cpp
@@ -3,7 +3,7 @@
 #include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>
 #include <CGAL/Simple_cartesian.h>
 #include <CGAL/Mean_curvature_flow_skeletonization.h>
-#include <CGAL/Polygon_mesh_processing/connected_components.h>
+#include <CGAL/internal/corefinement/connected_components.h>
 #include <CGAL/IO/Polyhedron_iostream.h>
 
 #include <fstream>
diff --git a/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/skeleton_connectivity_test.cpp b/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/skeleton_connectivity_test.cpp
index c6984fac8a5..0fab0e9af72 100644
--- a/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/skeleton_connectivity_test.cpp
+++ b/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/skeleton_connectivity_test.cpp
@@ -3,7 +3,7 @@
 #include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>
 #include <CGAL/Simple_cartesian.h>
 #include <CGAL/extract_mean_curvature_flow_skeleton.h>
-#include <CGAL/Polygon_mesh_processing/connected_components.h>
+#include <CGAL/internal/corefinement/connected_components.h>
 #include <CGAL/IO/Polyhedron_iostream.h>
 
 #include <boost/foreach.hpp>