diff --git a/Intersections_3/include/CGAL/Intersections_3/internal/Plane_3_Triangle_3_intersection.h b/Intersections_3/include/CGAL/Intersections_3/internal/Plane_3_Triangle_3_intersection.h
index 7f76c9d6000..30a83a7e96a 100644
--- a/Intersections_3/include/CGAL/Intersections_3/internal/Plane_3_Triangle_3_intersection.h
+++ b/Intersections_3/include/CGAL/Intersections_3/internal/Plane_3_Triangle_3_intersection.h
@@ -19,6 +19,8 @@
 #include <CGAL/enum.h>
 #include <CGAL/kernel_assertions.h>
 
+#include <boost/next_prior.hpp>
+
 namespace CGAL {
 namespace Intersections {
 namespace internal {