diff --git a/Intersections_3/include/CGAL/bbox_intersection_3.h b/Intersections_3/include/CGAL/Intersections_3/internal/bbox_intersection_3.h
similarity index 100%
rename from Intersections_3/include/CGAL/bbox_intersection_3.h
rename to Intersections_3/include/CGAL/Intersections_3/internal/bbox_intersection_3.h
diff --git a/Intersections_3/include/CGAL/Intersections_3/intersection_3_1_impl.h b/Intersections_3/include/CGAL/Intersections_3/internal/intersection_3_1_impl.h
similarity index 100%
rename from Intersections_3/include/CGAL/Intersections_3/intersection_3_1_impl.h
rename to Intersections_3/include/CGAL/Intersections_3/internal/intersection_3_1_impl.h
diff --git a/Intersections_3/include/CGAL/intersection_3_1.h b/Intersections_3/include/CGAL/intersection_3_1.h
index 3d6a6338ade..b8b607d3500 100644
--- a/Intersections_3/include/CGAL/intersection_3_1.h
+++ b/Intersections_3/include/CGAL/intersection_3_1.h
@@ -28,7 +28,7 @@
 #ifndef CGAL_INTERSECTION_3_1_H
 #define CGAL_INTERSECTION_3_1_H
 
-#include <CGAL/bbox_intersection_3.h>
-#include <CGAL/Intersections_3/intersection_3_1_impl.h>
+#include <CGAL/Intersections_3/internal/bbox_intersection_3.h>
+#include <CGAL/Intersections_3/internal/intersection_3_1_impl.h>
 
 #endif // CGAL_INTERSECTION_3_1_H