diff --git a/Intersections_2/include/CGAL/Triangle_2_Iso_rectangle_2_intersection.h b/Intersections_2/include/CGAL/Triangle_2_Iso_rectangle_2_intersection.h
index 579d530acc2..3dd2a9fb9c5 100644
--- a/Intersections_2/include/CGAL/Triangle_2_Iso_rectangle_2_intersection.h
+++ b/Intersections_2/include/CGAL/Triangle_2_Iso_rectangle_2_intersection.h
@@ -27,6 +27,7 @@
 #include <CGAL/Iso_rectangle_2.h>
 #include <CGAL/Segment_2_Segment_2_intersection.h>
 #include <CGAL/Intersection_traits_2.h>
+#include <CGAL/Segment_2_Iso_rectangle_2_intersection.h>
 
 #include <vector>
 #include <list>
@@ -304,10 +305,18 @@ namespace CGAL{ namespace internal {
     
     typename K::Has_on_unbounded_side_2 unbounded_side=k.has_on_unbounded_side_2_object();
     typename K::Construct_vertex_2 vertex=k.construct_vertex_2_object();
+
     for (int i=0;i<3;++i)
       if ( !unbounded_side( ir,vertex(tr,i) ) ) return true;
     for (int i=0;i<4;++i)
       if ( !unbounded_side( tr,vertex(ir,i) ) ) return true;
+
+    typename K::Construct_segment_2 segment=k.construct_segment_2_object();
+    for (int i=0;i<3;++i)
+      if ( do_intersect(
+            segment(vertex(tr,i),vertex(tr,(i+1)%3)),
+            ir, k) ) return true;
+
     return false;
   }
 
diff --git a/Intersections_2/test/Intersections_2/test_intersections_2.cpp b/Intersections_2/test/Intersections_2/test_intersections_2.cpp
index 0d8c84f6964..512236d8933 100644
--- a/Intersections_2/test/Intersections_2/test_intersections_2.cpp
+++ b/Intersections_2/test/Intersections_2/test_intersections_2.cpp
@@ -324,6 +324,7 @@ check_no_intersection  (L(p(0, 0), p(10,10)), L(p(8,7), p(1, 0)));
     check_intersection<T>(Rec(p( 0,  0), p(3, 3)), T(p(    1,   1), p(  2,   1), p(1,  2)));
     check_intersection<P>(Rec(p( 0,  0), p(1, 1)), T(p(  -1,   0), p(    0,  0), p(0,  -1)));
     check_intersection<P>(Rec(p( 0,  0), p(1, 1)), T(p(    0,  0), p(  -1,   0), p(0,  -1)));
+    check_intersection<Pol>(Rec(p( 100,  100), p(200, 200)), T(p(150, 50), p(250, 170), p(50, 170)));
   }
   
   void run()