diff --git a/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/CMakeLists.txt b/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/CMakeLists.txt
index 79879db96c3..fac2c9508e9 100644
--- a/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/CMakeLists.txt
+++ b/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/CMakeLists.txt
@@ -20,7 +20,7 @@ if(CGAL_FOUND)
   create_single_source_cgal_program("terrain_height_modeling.cpp")
 
   # this code is deprecated:
-  # create_single_source_cgal_program("deprecated_coordinates.cpp")
+  create_single_source_cgal_program("deprecated_coordinates.cpp")
 
   find_package(Eigen3 REQUIRED)
   include(CGAL_Eigen3_support)
diff --git a/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/deprecated_coordinates.cpp b/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/deprecated_coordinates.cpp
index be0db1984ab..1fe83eb01e1 100644
--- a/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/deprecated_coordinates.cpp
+++ b/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/deprecated_coordinates.cpp
@@ -1,3 +1,4 @@
+#include <CGAL/internal/disable_deprecation_warnings_and_errors.h>
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 #include <CGAL/Barycentric_coordinates_2/Generalized_barycentric_coordinates_2.h>
 #include <CGAL/Barycentric_coordinates_2/Mean_value_2.h>
diff --git a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/CMakeLists.txt b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/CMakeLists.txt
index 780fba053b4..d758922c470 100644
--- a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/CMakeLists.txt
+++ b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/CMakeLists.txt
@@ -40,6 +40,7 @@ if(CGAL_FOUND)
   create_single_source_cgal_program("test_dh_triangle.cpp")
   create_single_source_cgal_program("test_dh_weights.cpp")
 
+  # this code is deprecated:
   create_single_source_cgal_program("test_sc_deprecated_api.cpp")
   create_single_source_cgal_program("test_tc_deprecated_api.cpp")
   create_single_source_cgal_program("test_wp_deprecated_api.cpp")
diff --git a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_dh_deprecated_api.cpp b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_dh_deprecated_api.cpp
index 2158b765d15..c88fec47b6c 100644
--- a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_dh_deprecated_api.cpp
+++ b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_dh_deprecated_api.cpp
@@ -1,5 +1,6 @@
 #include <cmath>
 #include <cassert>
+#include <CGAL/internal/disable_deprecation_warnings_and_errors.h>
 #include <CGAL/Exact_predicates_exact_constructions_kernel.h>
 #include <CGAL/Barycentric_coordinates_2/triangle_coordinates_2.h>
 #include <CGAL/Barycentric_coordinates_2/Discrete_harmonic_2.h>
diff --git a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_mv_deprecated_api.cpp b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_mv_deprecated_api.cpp
index 4128b799afa..ceb5032a11d 100644
--- a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_mv_deprecated_api.cpp
+++ b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_mv_deprecated_api.cpp
@@ -1,5 +1,6 @@
 #include <cmath>
 #include <cassert>
+#include <CGAL/internal/disable_deprecation_warnings_and_errors.h>
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 #include <CGAL/Barycentric_coordinates_2/triangle_coordinates_2.h>
 #include <CGAL/Barycentric_coordinates_2/Mean_value_2.h>
diff --git a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_sc_deprecated_api.cpp b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_sc_deprecated_api.cpp
index da0ccb309bc..58c5d90d9a9 100644
--- a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_sc_deprecated_api.cpp
+++ b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_sc_deprecated_api.cpp
@@ -1,5 +1,6 @@
 #include <cmath>
 #include <cassert>
+#include <CGAL/internal/disable_deprecation_warnings_and_errors.h>
 #include <CGAL/Exact_predicates_exact_constructions_kernel.h>
 #include <CGAL/Barycentric_coordinates_2/segment_coordinates_2.h>
 
diff --git a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_tc_deprecated_api.cpp b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_tc_deprecated_api.cpp
index f6ce90dbaf1..96cc0ca9d63 100644
--- a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_tc_deprecated_api.cpp
+++ b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_tc_deprecated_api.cpp
@@ -1,5 +1,6 @@
 #include <cmath>
 #include <cassert>
+#include <CGAL/internal/disable_deprecation_warnings_and_errors.h>
 #include <CGAL/Exact_predicates_exact_constructions_kernel.h>
 #include <CGAL/Barycentric_coordinates_2/triangle_coordinates_2.h>
 
diff --git a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_wp_deprecated_api.cpp b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_wp_deprecated_api.cpp
index 62c0eef4237..7cec0a43668 100644
--- a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_wp_deprecated_api.cpp
+++ b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/test_wp_deprecated_api.cpp
@@ -1,5 +1,6 @@
 #include <cmath>
 #include <cassert>
+#include <CGAL/internal/disable_deprecation_warnings_and_errors.h>
 #include <CGAL/Exact_predicates_exact_constructions_kernel.h>
 #include <CGAL/Barycentric_coordinates_2/Wachspress_2.h>
 #include <CGAL/Barycentric_coordinates_2/triangle_coordinates_2.h>