diff --git a/Circular_kernel_2/include/CGAL/Circular_arc_2.h b/Circular_kernel_2/include/CGAL/Circular_arc_2.h
index d986dca398e..f54853fd48f 100644
--- a/Circular_kernel_2/include/CGAL/Circular_arc_2.h
+++ b/Circular_kernel_2/include/CGAL/Circular_arc_2.h
@@ -299,7 +299,11 @@ public:
     : P_arc(a),bb(NULL) 
 	{}
 
-	Circular_arc_2(const Circular_arc_2 &c) : P_arc(c.P_arc), bb(NULL) {}
+	Circular_arc_2(const Circular_arc_2 &c) : P_arc(c.P_arc) 
+	{
+	  if(c.bb) bb = new Bbox_2(*(c.bb));
+		else bb = NULL;	
+	}
 
 	~Circular_arc_2() { if(bb) delete bb; }
 
diff --git a/Circular_kernel_2/include/CGAL/Circular_arc_point_2.h b/Circular_kernel_2/include/CGAL/Circular_arc_point_2.h
index 5397b93d320..b70e0e04856 100644
--- a/Circular_kernel_2/include/CGAL/Circular_arc_point_2.h
+++ b/Circular_kernel_2/include/CGAL/Circular_arc_point_2.h
@@ -172,7 +172,12 @@ public:
     : P_point(p),bb(NULL)
       {}
 
-	Circular_arc_point_2(const Circular_arc_point_2 &c) : P_point(c.P_point), bb(NULL) {}
+	Circular_arc_point_2(const Circular_arc_point_2 &c) : P_point(c.P_point) 
+	{
+		if(c.bb) bb = new Bbox_2(*(c.bb));
+		else bb = NULL;
+	}
+	
 	~Circular_arc_point_2() { if(bb) delete bb; }
 
   ////Accesors////
diff --git a/Circular_kernel_2/include/CGAL/Line_arc_2.h b/Circular_kernel_2/include/CGAL/Line_arc_2.h
index 37c8ec08153..42b62fbf92b 100644
--- a/Circular_kernel_2/include/CGAL/Line_arc_2.h
+++ b/Circular_kernel_2/include/CGAL/Line_arc_2.h
@@ -246,7 +246,12 @@ public:
     		: P_arc(a) , bb(NULL)
 		{}
 
-	  Line_arc_2(const Line_arc_2 &c) : P_arc(c.P_arc), bb(NULL) {}
+	  Line_arc_2(const Line_arc_2 &c) : P_arc(c.P_arc)
+	  {
+		  if(c.bb) bb = new Bbox_2(*(c.bb));
+			else bb = NULL;	
+		}
+		
 	  ~Line_arc_2() { if(bb) delete bb; }