diff --git a/Kernel_23/include/CGAL/Direction_2.h b/Kernel_23/include/CGAL/Direction_2.h
index 6f65089765c..f878763fa40 100644
--- a/Kernel_23/include/CGAL/Direction_2.h
+++ b/Kernel_23/include/CGAL/Direction_2.h
@@ -27,6 +27,7 @@
 #include <boost/static_assert.hpp>
 #include <boost/type_traits.hpp>
 #include <CGAL/Kernel/Return_base_tag.h>
+#include <CGAL/representation_tags.h>
 
 CGAL_BEGIN_NAMESPACE
 
diff --git a/Kernel_23/include/CGAL/Direction_3.h b/Kernel_23/include/CGAL/Direction_3.h
index 2c536d29da9..56420db9a52 100644
--- a/Kernel_23/include/CGAL/Direction_3.h
+++ b/Kernel_23/include/CGAL/Direction_3.h
@@ -27,6 +27,7 @@
 #include <boost/static_assert.hpp>
 #include <boost/type_traits.hpp>
 #include <CGAL/Kernel/Return_base_tag.h>
+#include <CGAL/representation_tags.h>
 
 CGAL_BEGIN_NAMESPACE
 
diff --git a/Kernel_23/include/CGAL/Point_2.h b/Kernel_23/include/CGAL/Point_2.h
index feaa62dde65..5c370d85147 100644
--- a/Kernel_23/include/CGAL/Point_2.h
+++ b/Kernel_23/include/CGAL/Point_2.h
@@ -29,6 +29,7 @@
 #include <boost/static_assert.hpp>
 #include <boost/type_traits.hpp>
 #include <CGAL/Kernel/Return_base_tag.h>
+#include <CGAL/representation_tags.h>
 
 CGAL_BEGIN_NAMESPACE
 
diff --git a/Kernel_23/include/CGAL/Point_3.h b/Kernel_23/include/CGAL/Point_3.h
index dd036316872..72ea3337670 100644
--- a/Kernel_23/include/CGAL/Point_3.h
+++ b/Kernel_23/include/CGAL/Point_3.h
@@ -30,6 +30,7 @@
 #include <boost/type_traits.hpp>
 #include <CGAL/Kernel/Return_base_tag.h>
 #include <CGAL/Bbox_3.h>
+#include <CGAL/representation_tags.h>
 
 CGAL_BEGIN_NAMESPACE
 
diff --git a/Kernel_23/include/CGAL/Ray_2.h b/Kernel_23/include/CGAL/Ray_2.h
index ae77f561d73..e8cd0d7c86a 100644
--- a/Kernel_23/include/CGAL/Ray_2.h
+++ b/Kernel_23/include/CGAL/Ray_2.h
@@ -27,6 +27,7 @@
 #include <boost/static_assert.hpp>
 #include <boost/type_traits.hpp>
 #include <CGAL/Kernel/Return_base_tag.h>
+#include <CGAL/representation_tags.h>
 
 CGAL_BEGIN_NAMESPACE
 
diff --git a/Kernel_23/include/CGAL/Ray_3.h b/Kernel_23/include/CGAL/Ray_3.h
index 316b7a6661e..b687740ed7d 100644
--- a/Kernel_23/include/CGAL/Ray_3.h
+++ b/Kernel_23/include/CGAL/Ray_3.h
@@ -27,6 +27,7 @@
 #include <boost/static_assert.hpp>
 #include <boost/type_traits.hpp>
 #include <CGAL/Kernel/Return_base_tag.h>
+#include <CGAL/representation_tags.h>
 
 CGAL_BEGIN_NAMESPACE
 
diff --git a/Kernel_23/include/CGAL/Sphere_3.h b/Kernel_23/include/CGAL/Sphere_3.h
index b2c41447eb5..501d5274db3 100644
--- a/Kernel_23/include/CGAL/Sphere_3.h
+++ b/Kernel_23/include/CGAL/Sphere_3.h
@@ -28,6 +28,7 @@
 #include <boost/type_traits.hpp>
 #include <CGAL/Kernel/Return_base_tag.h>
 #include <CGAL/Bbox_3.h>
+#include <CGAL/representation_tags.h>
 
 CGAL_BEGIN_NAMESPACE
 
diff --git a/Kernel_23/include/CGAL/Vector_2.h b/Kernel_23/include/CGAL/Vector_2.h
index 2a7b6f3068b..e450e47e93e 100644
--- a/Kernel_23/include/CGAL/Vector_2.h
+++ b/Kernel_23/include/CGAL/Vector_2.h
@@ -29,6 +29,7 @@
 #include <boost/static_assert.hpp>
 #include <boost/type_traits.hpp>
 #include <CGAL/Kernel/Return_base_tag.h>
+#include <CGAL/representation_tags.h>
 
 CGAL_BEGIN_NAMESPACE