diff --git a/Segment_Delaunay_graph_2/include/CGAL/Segment_Delaunay_graph_2/Sqrt_extension_2.h b/Segment_Delaunay_graph_2/include/CGAL/Segment_Delaunay_graph_2/Sqrt_extension_2.h
index 0560ebfc987..c01baf9e089 100644
--- a/Segment_Delaunay_graph_2/include/CGAL/Segment_Delaunay_graph_2/Sqrt_extension_2.h
+++ b/Segment_Delaunay_graph_2/include/CGAL/Segment_Delaunay_graph_2/Sqrt_extension_2.h
@@ -65,11 +65,6 @@ public:
     CGAL_exactness_precondition( !(CGAL::is_negative(B_)) );
   }
 
-  Sqrt_extension_2(const Sqrt_extension_2<NT>& other)
-    : a0_(other.a0_), a1_(other.a1_), a2_(other.a2_),
-      a3_(other.a3_), A_(other.A_), B_(other.B_) {}
-
-
   NT a() const { return a0_; }
   NT b() const { return a1_; }
   NT c() const { return a2_; }