diff --git a/Triangulation_3/include/CGAL/Regular_triangulation_3.h b/Triangulation_3/include/CGAL/Regular_triangulation_3.h
index 0cf68b16496..cc97183dc44 100644
--- a/Triangulation_3/include/CGAL/Regular_triangulation_3.h
+++ b/Triangulation_3/include/CGAL/Regular_triangulation_3.h
@@ -27,7 +27,6 @@
 #include <CGAL/license/Triangulation_3.h>
 
 #include <CGAL/basic.h>
-#include <CGAL/Regular_traits_adaptor.h>
 
 #include <set>
 #include <boost/mpl/if.hpp>