diff --git a/Periodic_2_triangulation_2/include/CGAL/draw_periodic_2_triangulation_2.h b/Periodic_2_triangulation_2/include/CGAL/draw_periodic_2_triangulation_2.h
index 8c25a218a52..2406915d842 100644
--- a/Periodic_2_triangulation_2/include/CGAL/draw_periodic_2_triangulation_2.h
+++ b/Periodic_2_triangulation_2/include/CGAL/draw_periodic_2_triangulation_2.h
@@ -296,13 +296,4 @@ void draw(const P2T2& ap2t2)
 
 #endif // CGAL_USE_BASIC_VIEWER
 
-#else // CGAL_USE_BASIC_VIEWER
-
-template<class P2T2>
-void draw_periodic_2_triangulation_2(CGAL::Periodic_2_Triangulation_2<P2T2>&)
-{
-  std::cerr << "Impossible to draw, CGAL_USE_BASIC_VIEWER is not defined."
-            << std::endl;
-}
-
 #endif // DRAW_PERIODIC_2_TRIANGULATION_2_H
diff --git a/Voronoi_diagram_2/include/CGAL/draw_voronoi_diagram_2.h b/Voronoi_diagram_2/include/CGAL/draw_voronoi_diagram_2.h
index ad073532e7f..4b4e4a6c652 100644
--- a/Voronoi_diagram_2/include/CGAL/draw_voronoi_diagram_2.h
+++ b/Voronoi_diagram_2/include/CGAL/draw_voronoi_diagram_2.h
@@ -18,8 +18,8 @@
 //
 // Author(s)     : Jasmeet Singh <jasmeet.singh.mec11@iitbhu.ac.in>
 
-#ifndef CGAL_DRAW_VORONOI_H
-#define CGAL_DRAW_VORONOI_H
+#ifndef CGAL_DRAW_VORONOI_DIAGRAM_2_H
+#define CGAL_DRAW_VORONOI_DIAGRAM_2_H
 
 #include <CGAL/Qt/Basic_viewer_qt.h>
 #include <CGAL/license/Voronoi_diagram_2.h>
@@ -355,15 +355,6 @@ template <class V2> void draw(const V2 &av2) {
 
 } // End namespace CGAL
 
-#else // CGAL_USE_BASIC_VIEWER
-
-template<class V2>
-void draw_voronoi_diagram_2(CGAL::VoronoiDiagram_2<V2>&)
-{
-  std::cerr << "Impossible to draw, CGAL_USE_BASIC_VIEWER is not defined."
-            << std::endl;
-}
-
 #endif // CGAL_USE_BASIC_VIEWER
 
-#endif // CGAL_DRAW_VORONOI_H
+#endif // CGAL_DRAW_VORONOI_DIAGRAM_2_H