diff --git a/Kernel_23/include/CGAL/Kernel/global_functions_internal_3.h b/Kernel_23/include/CGAL/Kernel/global_functions_internal_3.h
index 89eb748c483..fe5ae2a04a4 100644
--- a/Kernel_23/include/CGAL/Kernel/global_functions_internal_3.h
+++ b/Kernel_23/include/CGAL/Kernel/global_functions_internal_3.h
@@ -31,7 +31,7 @@
 #include <CGAL/basic.h>
 #include <CGAL/Dimension.h>
 #include <boost/utility/enable_if.hpp>
-#include "boost/mpl/equal_to.hpp"
+#include <boost/mpl/equal_to.hpp>
 #include <boost/mpl/integral_c.hpp>
 
 namespace CGAL {