diff --git a/Periodic_3_triangulation_3/include/CGAL/Periodic_3_regular_triangulation_3.h b/Periodic_3_triangulation_3/include/CGAL/Periodic_3_regular_triangulation_3.h
index 3e806a7ba50..7eed15886cd 100644
--- a/Periodic_3_triangulation_3/include/CGAL/Periodic_3_regular_triangulation_3.h
+++ b/Periodic_3_triangulation_3/include/CGAL/Periodic_3_regular_triangulation_3.h
@@ -909,7 +909,7 @@ public:
       std::cout << "four offsets: " << std::endl;
 #endif
 
-      boost::array<int, 4> offsets;
+      std::array<int, 4> offsets;
       for(int i=0; i<4; ++i)
       {
 #ifdef CGAL_PERIODIC_SET_POINT_VERBOSE