diff --git a/Segment_Delaunay_graph_2/test/Segment_Delaunay_graph_2/test_sdg_2_et.cpp b/Segment_Delaunay_graph_2/test/Segment_Delaunay_graph_2/test_sdg_2_et.cpp
index 13b1668d707..322f9d468f2 100644
--- a/Segment_Delaunay_graph_2/test/Segment_Delaunay_graph_2/test_sdg_2_et.cpp
+++ b/Segment_Delaunay_graph_2/test/Segment_Delaunay_graph_2/test_sdg_2_et.cpp
@@ -5,7 +5,21 @@
 #include <cassert>
 
 // choose number type
-#ifdef CGAL_USE_GMP
+
+// choose number type
+#ifdef CGAL_USE_LEDA
+
+#  include <CGAL/leda_rational.h>
+typedef leda_rational                     exact_ring_t;
+typedef leda_rational                     exact_field_t;
+
+namespace CGAL {
+// needed for the drawing methods
+leda_rational sqrt(const leda_rational& x) {
+  return leda_rational(  CGAL::sqrt( CGAL::to_double(x) )  );
+}
+}
+#elif defined( CGAL_USE_GMP )
 
 #  include <CGAL/Gmpq.h>
 typedef CGAL::Gmpq                     exact_ring_t;
diff --git a/Segment_Delaunay_graph_2/test/Segment_Delaunay_graph_2/test_sdg_hierarchy_2_et.cpp b/Segment_Delaunay_graph_2/test/Segment_Delaunay_graph_2/test_sdg_hierarchy_2_et.cpp
index 30cf2507dce..b872a1261b3 100644
--- a/Segment_Delaunay_graph_2/test/Segment_Delaunay_graph_2/test_sdg_hierarchy_2_et.cpp
+++ b/Segment_Delaunay_graph_2/test/Segment_Delaunay_graph_2/test_sdg_hierarchy_2_et.cpp
@@ -5,7 +5,19 @@
 #include <cassert>
 
 // choose number type
-#ifdef CGAL_USE_GMP
+#ifdef CGAL_USE_LEDA
+
+#  include <CGAL/leda_rational.h>
+typedef leda_rational                     exact_ring_t;
+typedef leda_rational                     exact_field_t;
+
+namespace CGAL {
+// needed for the drawing methods
+leda_rational sqrt(const leda_rational& x) {
+  return leda_rational(  CGAL::sqrt( CGAL::to_double(x) )  );
+}
+}
+#elif defined( CGAL_USE_GMP )
 
 #  include <CGAL/Gmpq.h>
 typedef CGAL::Gmpq                     exact_ring_t;